Leaves dimorphic; juvenile leaves opposite; adult leaves usually disjunct opposite (appearing alternate); similifacial or less commonly dorsiventral, oil glands usually present in leaves.
Inflorescences usually based on condensed dichasia, forming umbellasters, mostly solitary and axillary but sometimes aggregated into compound terminal, pseudo-terminal or axillary structures; individual umbellasters usually 7-flowered, but ranging from 1 to >30 flowers in some species. Calyx and/or corolla fused into a calyptra which persists to anthesis. Stamens numerous, usually in several continuous whorls; anthers versatile or adnate, dehiscing by separate or confluent slits or pores. Ovary half-inferior, 2–7-locular, enclosed by hypanthium except at top; ovules numerous, ovulodes present.
Fruit a capsule, becoming woody in most species.
Species of Eucalyptus dominate most plant communities in all but the wettest, coldest and driest parts of the continent.
Many species are economically of great importance within Australia as timber, nectar resources for honey production, and for shelter in agricultural and pastoral regions. Species are extensively planted world-wide for timber, fuel, essential oils and pharmaceuticals. The eucalypts show a wide diversity, yet individual species are frequently finely defined and difficult to differentiate. Active taxonomic and morphological study in the group is proceeding, and many species remain to be defined. Generic and infrageneric relationships and limits are also under review. A summary and bibliography are presented by Chippendale (1988). A recent classification by Brooker (2000), formalises many of the names of Pryor and Johnson (1971) for infrageneric taxa that had not been formally published. However, species in this treatment are arranged in natural groupings in the text, following Pryor and Johnson (1971) and subsequent modifications of that system, not that of Brooker (2000).
| Key to the species | |
1 | Bark rough, persistent over entire trunk | 2 |
| Bark smooth on trunk | 170 |
2 | Ironbarks | 3 |
| Bark not ironbark Back to 1 | 25 |
3 | Stamens with filaments regularly inflexed, anthers cuboid | 4 |
| Stamens with filaments irregularly flexed, anthers globose Back to 2 | 17 |
4 | Adult leaves strongly discolorous | 5 |
| Adult leaves concolorous or weakly discolorous Back to 3 | 6 |
5 | Fruit 4-angled | Eucalyptus fergusonii |
| Fruit not angled Back to 4 | Eucalyptus paniculata |
6 | Calyptra scar present | 7 |
| No calyptra scar present Back to 4 | 16 |
7 | Adult leaves glossy | 8 |
| Adult leaves dull Back to 6 | 9 |
8 | Longest petioles <20 mm long, largest adult leaves <15 cm long | Eucalyptus placita |
| Longest petioles >20 mm long, largest adult leaves >15 cm long Back to 7 | Eucalyptus ancophila |
9 | Adult leaves <1.2 cm wide | Eucalyptus beyeriana |
| Adult leaves >1.2 cm wide Back to 7 | 10 |
10 | Adult leaves green or grey-green | 11 |
| Adult leaves glaucous Back to 9 | 14 |
11 | Fruit 4-angled | Eucalyptus tetrapleura |
| Fruit not angled Back to 10 | 12 |
12 | Juvenile leaves glossy green | Eucalyptus ancophila |
| Juvenile leaves dull, grey-green Back to 11 | 13 |
13 | Juvenile leaves lanceolate, 15–20 cm long | Eucalyptus fusiformis |
| Juvenile leaves narrow-elliptic to elliptic, 3.5–9 cm long Back to 12 | Eucalyptus scopulorum |
14 | Fruit longer than broad; adult leaves acute | 15 |
| Fruit shorter than broad; adult leaves rounded Back to 10 | Eucalyptus panda |
15 | Adult leaves broad-lanceolate to ovate | Eucalyptus caleyi |
| Adult leaves narrow-lanceolate to lanceolate Back to 14 | Eucalyptus fusiformis |
16 | Inflorescences 3-flowered | Eucalyptus tricarpa |
| Inflorescences >3-flowered Back to 6 | Eucalyptus sideroxylon |
17 | Adult leaves opposite, ovate to orbiculate | Eucalyptus melanophloia |
| Adult leaves disjunct, broad-lanceolate or narrow-lanceolate Back to 3 | 18 |
18 | Valves distinctly exserted | 19 |
| Valves not distinctly exserted Back to 17 | 22 |
19 | Buds not glaucous | 20 |
| Buds glaucous Back to 18 | Eucalyptus nubila |
20 | Calyptra more than twice as long as hypanthium | Eucalyptus fibrosa |
| Calyptra less than twice a long as hypanthium Back to 19 | 21 |
21 | Disc flat | Eucalyptus ophitica |
| Disc depressed Back to 20 | Eucalyptus siderophloia |
22 | Calyptra conical, acute; juvenile leaves orbiculate to broad-lanceolate | 23 |
| Calyptra rounded or obtuse; juvenile leaves linear to narrow-lanceolate Back to 18 | Eucalyptus crebra |
23 | Buds glaucous | Eucalyptus nubila |
| Buds not glaucous Back to 22 | 24 |
24 | Juvenile leaves broad-lanceolate to ovate, apex acute or obtuse | Eucalyptus siderophloia |
| Juvenile leaves orbiculate, apex rounded Back to 23 | Eucalyptus fracta |
25 | Stringybarks | 26 |
| Not stringybarks Back to 2 | 70 |
26 | Fruit pyriform to conical, flat-topped; inflorescences aggregated or paired | 27 |
| Fruit not as above; inflorescences usually solitary Back to 25 | 28 |
27 | Inflorescences axillary, often paired; calyptra scar absent | Eucalyptus fastigata |
| Inflorescences aggregated at shoot tips; calyptra scar present Back to 26 | Eucalyptus microcorys |
28 | Fruit ovoid to urceolate and disc strongly depressed | 29 |
| Fruit hemispherical to globose or ovoid; if ovoid then disc not strongly depressed Back to 26 | 33 |
29 | Fruit smooth | 30 |
| Fruit ribbed Back to 28 | Eucalyptus planchoniana |
30 | Adult leaves concolorous | Eucalyptus obliqua |
| Adult leaves strongly discolorous Back to 29 | 31 |
31 | Fruit 4-lobed at top | Eucalyptus baileyana |
| Fruit not 4-lobed at top Back to 30 | 32 |
32 | Buds and fruit sessile | Eucalyptus botryoides |
| Buds and fruit pedicellate Back to 31 | Eucalyptus robusta |
33 | Leaves with lateral veins obtuse, reticulation dense and regular, juvenile leaves glabrous | 34 |
| Leaves with lateral veins acute, reticulation sparse and irregular; juvenile leaves hairy Back to 28 | 38 |
34 | Adult leaves strongly discolorous | Eucalyptus acmenoides |
| Adult leaves not strongly discolorous Back to 33 | 35 |
35 | Juvenile leaves broad-lanceolate to ovate | 36 |
| Juvenile leaves narrow-lanceolate Back to 34 | 37 |
36 | Adult leaves green | Eucalyptus umbra |
| Adult leaves blue Back to 35 | Eucalyptus carnea |
37 | Fruit 5–6 mm diam. | Eucalyptus apothalassica |
| Fruit 6–8 mm diam. Back to 35 | Eucalyptus psammitica |
38 | Buds and fruit distinctly pedicellate, fruit clusters open | 39 |
| Buds and fruit sessile or shortly pedicellate (pedicels obscured if present), fruit clusters crowded Back to 33 | 48 |
39 | Leaves strongly discolorous | Eucalyptus muelleriana |
| Leaves concolorous or weakly discolorous Back to 38 | 40 |
40 | Disc broad, raised | 41 |
| Disc narrow, not raised Back to 39 | 46 |
41 | Buds acute or rostrate | 42 |
| Buds rounded Back to 40 | 45 |
42 | Buds rostrate | 43 |
| Buds acute Back to 41 | 44 |
43 | Buds angular | Eucalyptus cannonii |
| Buds not angular Back to 42 | Eucalyptus macrorhyncha |
44 | Buds angular | Eucalyptus subtilior |
| Buds not angular Back to 42 | Eucalyptus tindaliae |
45 | Buds angular | Eucalyptus prominula |
| Buds not angular Back to 41 | Eucalyptus laevopinea |
46 | Adult leaves with length:breadth ratio of <3:1 | Eucalyptus caliginosa |
| Adult leaves with length:breadth ratio of >3:1 Back to 40 | 47 |
47 | Adult leaves thin, noticeably discolorous | Eucalyptus eugenioides |
| Adult leaves not thin, concolorous Back to 46 | Eucalyptus conjuncta |
48 | Adult leaves with length:breadth ratio of >3:1 | 49 |
| Adult leaves with length:breadth ratio of <3:1 Back to 38 | 63 |
49 | Valves small, mostly enclosed | 50 |
| Valves large, prominently exserted Back to 48 | 60 |
50 | Adult leaves with a bluish sheen | 51 |
| Adult leaves green, without a bluish sheen Back to 49 | 52 |
51 | Juvenile leaves ovate (length:breadth ratio of 1.5–2:1), petiole >5 mm long | Eucalyptus agglomerata |
| Juvenile leaves broad-lanceolate to ovate (length:breadth ratio of 2–2.5:1), petiole <5 mm long Back to 50 | Eucalyptus subcaerulea |
52 | Buds angular | Eucalyptus capitellata |
| Buds not angular Back to 50 | 53 |
53 | Juvenile leaves broad-lanceolate to ovate | 54 |
| Juvenile leaves narrow-lanceolate Back to 52 | 57 |
54 | Fruit globose to flattened-globose | 55 |
| Fruit hemispherical Back to 53 | Eucalyptus cameronii |
55 | Adult leaves concolorous; south of the Hunter River | 56 |
| Adult leaves slightly discolorous; north from Coffs Harbour Back to 54 | Eucalyptus tindaliae |
56 | Fruit <7 mm diam. | Eucalyptus oblonga |
| Fruit >7 mm diam. Back to 55 | Eucalyptus imitans |
57 | Adult leaves mostly <6 cm long | Eucalyptus tenella |
| Adult leaves mostly >6 cm long Back to 53 | 58 |
58 | Fruit hemispherical | Eucalyptus mckieana |
| Fruit globose or flattened-globose Back to 57 | 59 |
59 | Adult leaves lanceolate | Eucalyptus sparsifolia |
| Adult leaves linear to narrow-lanceolate Back to 58 | Eucalyptus ralla |
60 | Branchlets glaucous, sharply 4-angled or winged; fruit with a medial ridge; usually mallees | Eucalyptus boliviana |
| Branchlets not glaucous, terete or moderately 4-angled; trees Back to 49 | 61 |
61 | Intermediate leaves orbiculate | Eucalyptus williamsiana |
| Intermediate leaves oblong or elliptic Back to 60 | 62 |
62 | Buds and adult leaves glossy green | Eucalyptus youmanii |
| Buds and leaves ± dull, ± bluish Back to 61 | Eucalyptus subtilior |
63 | Disc flat, valves mostly enclosed | 64 |
| Disc raised, valves distinctly exserted Back to 48 | 69 |
64 | Buds finely warty | Eucalyptus baxteri |
| Buds not warty Back to 63 | 65 |
65 | Buds angular | 66 |
| Buds not angular Back to 64 | 67 |
66 | Juvenile leaves cordate | Eucalyptus camfieldii |
| Juvenile leaves ovate Back to 65 | Eucalyptus bensonii |
67 | Adult leaves similifacial | Eucalyptus ligustrina |
| Adult leaves dorsiventral Back to 65 | 68 |
68 | Disc thick, flat | Eucalyptus globoidea |
| Disc thin, slightly depressed Back to 67 | Eucalyptus yangoura |
69 | Shrubs and mallees; branchlets glaucous | Eucalyptus boliviana ms. |
| Trees; branchlets not glaucous Back to 63 | Eucalyptus blaxlandii |
70 | Valves of fruit enclosed | 71 |
| Valves of fruit exserted Back to 25 | 135 |
71 | Adult leaves strongly discolorous | 72 |
| Adult leaves concolorous or weakly discolorous Back to 70 | 78 |
72 | Adult leaves closely penniveined | 73 |
| Adult leaves not closely penniveined Back to 71 | 75 |
73 | Buds and fruit sessile | Eucalyptus botryoides |
| Buds and fruit pedicellate Back to 72 | 74 |
74 | Fruit cylindrical to urceoolate, 10–18 mm long, 6–11 mm diam. | Eucalyptus robusta |
| Fruit conical to pyriform, 5–9 mm long, 4–6 mm diam. Back to 73 | Eucalyptus microcorys |
75 | Stamens regularly inflexed | 76 |
| Stamens irregularly flexed Back to 72 | Eucalyptus rummeryi |
76 | Adult leaves with some stomates on the upper surface | Eucalyptus rudderi |
| Adult leaves with stomates on the lower surface only Back to 75 | 77 |
77 | Fruit ovoid, 3–5 mm long, 2–4 mm diam. | Eucalyptus hypostomatica |
| Fruit conical to pyriform, 5–9 mm long, 4–6 mm diam. Back to 76 | Eucalyptus microcorys |
78 | Juvenile leaves opposite for many pairs | 79 |
| Juvenile leaves opposite for only a few pairs Back to 71 | 88 |
79 | Branchlets square | 80 |
| Branchlets not square Back to 78 | 81 |
80 | Buds and fruit glaucous | Eucalyptus pyrocarpa |
| Buds and fruit not glaucous Back to 79 | Eucalyptus pilularis |
81 | Adult leaves broad-lanceolate to ovate | 82 |
| Adult leaves mostly lanceolate or narrower Back to 79 | 84 |
82 | Adult leaves with 3 longitudinal veins (3-veined) | 83 |
| Adult leaves with only 1 longitudinal vein (midvein) Back to 81 | Eucalyptus dives |
83 | Juvenile leaves elliptic or orbiculate | Eucalyptus stellulata |
| Juvenile leaves narrow-elliptic Back to 82 | Eucalyptus copulans |
84 | Adult leaves green | 85 |
| Adult leaves blue Back to 81 | 87 |
85 | Bark rough on branches; disc flat | 86 |
| Branches wholly smooth; disc depressed Back to 84 | Eucalyptus elata |
86 | Calyptra scar absent | Eucalyptus radiata |
| Calyptra scar present Back to 85 | Eucalyptus aggregata |
87 | Adult leaves often >1.5 cm wide | Eucalyptus croajingolensis |
| Adult leaves <1.5 cm wide Back to 84 | Eucalyptus robertsonii |
88 | Calyptra scar absent | 89 |
| Calyptra scar present Back to 78 | 114 |
89 | Stamens regularly inflexed | 90 |
| Stamens irregularly flexed in bud Back to 88 | 97 |
90 | Anthers adnate, dehiscing through separate slits | 91 |
| Anthers versatile, reniform, dehiscing through confluent slits Back to 89 | 92 |
91 | Fruit much longer than broad | Eucalyptus ochrophloia |
| Fruit about as long as broad Back to 90 | Eucalyptus melliodora |
92 | Fine peppermint bark | 93 |
| Coarse thick fissured or fibrous bark Back to 90 | 95 |
93 | Fruit hemispherical | Eucalyptus andrewsii |
| Fruit not hemispherical Back to 92 | 94 |
94 | Northern Tablelands species | Eucalyptus campanulata |
| South Coast and Southern Tablelands species Back to 93 | Eucalyptus consideniana |
95 | Disc depressed | Eucalyptus stenostoma |
| Disc flat Back to 92 | 96 |
96 | Twigs glaucous, with a peppermint smell | Eucalyptus sieberi |
| Twigs not glaucous, with an unpleasant smell Back to 95 | Eucalyptus olida |
97 | Juvenile leaves green | 98 |
| Juvenile leaves blue Back to 89 | 110 |
98 | Juvenile leaves hairy; fruit 13–18 mm diam. | Eucalyptus olsenii |
| Juvenile leaves not hairy; fruit 2–10 mm diam. Back to 97 | 99 |
99 | Fruit with 5 or 6 valves | Eucalyptus bosistoana |
| Fruit with 3 or 4 valves Back to 98 | 100 |
100 | Adult leaves >1.5 cm wide | 101 |
| Adult leaves <1.5 cm wide Back to 99 | 104 |
101 | Disc depressed | 102 |
| Disc flat Back to 100 | Eucalyptus fastigata |
102 | Anthers versatile, reniform, dehiscing through confluent slits | Eucalyptus obliqua |
| Anthers adnate, dehiscing through separate slits Back to 101 | 103 |
103 | Adult leaves >2 cm wide; buds 5–9 mm long | Eucalyptus moluccana |
| Adult leaves <2 cm wide; buds 4–7 mm long Back to 102 | Eucalyptus microcarpa |
104 | Fruit <7 m diam. | 105 |
| Fruit >7 mm diam. Back to 100 | 108 |
105 | Trees | 106 |
| Mallees Back to 104 | 107 |
106 | Anthers versatile, reniform, dehiscing through confluent slits | Eucalyptus paliformis |
| Anthers adnate, dehiscing through separate slits Back to 105 | Eucalyptus pilligaensis |
107 | Adult leaves <1.0 cm wide | Eucalyptus viridis |
| Adult leaves >1.0 cm wide Back to 105 | Eucalyptus porosa |
108 | Inflorescences 3-flowered | Eucalyptus triflora |
| Inflorescences 7-flowered Back to 104 | 109 |
109 | Fruit urceolate | Eucalyptus fraxinoides |
109 | Fruit globose | Eucalyptus dendromorpha |
110 | Disc flat | Eucalyptus oreades |
| Disc depressed Back to 97 | 111 |
111 | Buds rounded; fruit >8 mm diam. | 112 |
| Buds acute; fruit <8 mm diam. Back to 110 | 113 |
112 | Anthers versatile, reniform, dehiscing through confluent slits | Eucalyptus delegatensis |
| Anthers adnate, dehiscing through separate slits Back to 111 | Eucalyptus albens |
113 | Anthers versatile, reniform, dehiscing through confluent slits | Eucalyptus piperita |
| Anthers adnate, dehiscing through separate slits Back to 111 | Eucalyptus polybractea |
114 | Stamens regularly inflexed | 115 |
| Stamens irregularly flexed Back to 88 | 125 |
115 | Adult leaves broad-lanceolate to ovate or elliptic | 116 |
| Adult leaves linear to lanceolate, occasionally broad-lanceolate Back to 114 | 118 |
116 | Fruit at least 6 mm long and 6 mm diam. | Eucalyptus magnificata |
| Fruit usually <6 mm long and 6 mm diam. Back to 115 | 117 |
117 | Adult leaves without loose white surface wax; coastal species | Eucalyptus baueriana |
| Adult leaves glaucous with loose white surface wax; tablelands and Western Slopes species Back to 116 | Eucalyptus polyanthemos |
118 | Inflorescences 3-flowered | Eucalyptus longifolia |
| Inflorescences >3-flowered Back to 115 | 119 |
119 | Trees | 120 |
| Mallees Back to 118 | 122 |
120 | Fruit hemispherical to ovoid | 121 |
| Fruit conical Back to 119 | Eucalyptus conica |
121 | Outer stamens infertile | Eucalyptus rudderi |
| All stamens fertile Back to 120 | Eucalyptus intertexta |
122 | Pith glands present | Eucalyptus costata |
| Pith glands absent Back to 119 | 123 |
123 | Disc broad, slightly depressed | Eucalyptus leptophylla |
| Disc narrow, steeply depressed Back to 122 | 124 |
124 | Fruit 4-angled | Eucalyptus calycogona |
| Fruit smooth Back to 123 | Eucalyptus gracilis |
125 | Buds and twigs glaucous | Eucalyptus nortonii |
| Buds and twigs non-glaucous Back to 114 | 126 |
126 | Adult leaves narrow-lanceolate to lanceolate | 127 |
| Adult leaves broad-lanceolate to ovate or ± elliptic, rarely lanceolate Back to 125 | 133 |
127 | Fruit <5 mm diam. | 128 |
| Fruit >5 mm diam. Back to 126 | 131 |
128 | Anthers adnate | 129 |
| Anthers versatile Back to 127 | 130 |
129 | Juvenile leaves broad-lanceolate (coastal forest tree) | Eucalyptus largeana |
| Juvenile leaves linear (far inland woodland tree) Back to 128 | Eucalyptus largiflorens |
130 | Fruit hemispherical; adult leaves dull | Eucalyptus acaciiformis |
| Fruit conical; adult leaves glossy Back to 128 | Eucalyptus aggregata |
131 | Fruit sessile | Eucalyptus goniocalyx |
| Fruit pedicellate Back to 127 | 132 |
132 | Juvenile leaves green | Eucalyptus retinens |
| Juvenile leaves glaucous Back to 131 | Eucalyptus volcanica |
133 | Trees | 134 |
| Mallees Back to 126 | Eucalyptus behriana |
134 | Anthers adnate | Eucalyptus populnea |
| Anthers versatile Back to 133 | Eucalyptus ovata |
135 | Adult leaves strongly discolorous | 136 |
| Adult leaves concolorous Back to 70 | 138 |
136 | Fruit >10 mm diam. | Eucalyptus scias |
| Fruit <10 mm diam. Back to 135 | 137 |
137 | Calyptra about as long as hypanthium | Eucalyptus notabilis |
| Calyptra much longer than hypanthium Back to 136 | Eucalyptus resinifera |
138 | Fruit sessile | 139 |
| Fruit pedicellate Back to 135 | 150 |
139 | Inflorescences 3-flowered | 140 |
| Inflorescences 7- or more-flowered Back to 138 | 145 |
140 | Adult leaves opposite | 141 |
| Adult leaves disjunct Back to 139 | 142 |
141 | Fruit conical | Eucalyptus cinerea |
| Fruit campanulate Back to 140 | Eucalyptus triplex |
142 | Juvenile leaves green | Eucalyptus badjensis |
| Juvenile leaves grey or blue Back to 140 | 143 |
143 | Fruit ovoid | Eucalyptus chapmaniana |
| Fruit campanulate Back to 142 | 144 |
144 | Branches smooth | Eucalyptus kartzoffiana |
| Branches with persistent fibrous bark Back to 143 | Eucalyptus alligatrix |
145 | Peduncle <3 mm long | Eucalyptus banksii |
| Peduncle >3 mm long Back to 139 | 146 |
146 | Fruit >6 mm diam. | 147 |
| Fruit <6 mm diam. Back to 145 | 149 |
147 | Adult leaves blue | 148 |
| Adult leaves green Back to 146 | Eucalyptus goniocalyx |
148 | Many adult leaves opposite | Eucalyptus conspicua |
| Adult leaves disjunct Back to 147 | Eucalyptus nortonii |
149 | Valves acute | Eucalyptus quadrangulata |
| Valves obtuse Back to 146 | Eucalyptus macarthurii |
150 | Calyptra >1.5 times as long as hypanthium | 151 |
| Calyptra equal in length to hypanthium Back to 138 | 156 |
151 | Disc raised | 152 |
| Disc not raised Back to 150 | 153 |
152 | Inflorescences 3-flowered | Eucalyptus morrisii |
| Inflorescences 7-flowered Back to 151 | Eucalyptus exserta |
153 | Disc flat | Eucalyptus bakeri |
| Disc sharply depressed Back to 151 | 154 |
154 | Mallees; inflorescences solitary | 155 |
| Trees; inflorescences often paired Back to 153 | Eucalyptus squamosa |
155 | Adult leaves opposite, ovate to broad-lanceolate or elliptic | Eucalyptus gillii |
| Adult leaves disjunct, lanceolate to broad-lanceolate Back to 154 | Eucalyptus socialis |
156 | Inflorescences compound | Eucalyptus coolabah |
| Inflorescences simple Back to 150 | 157 |
157 | Inflorescences often paired | 158 |
| Inflorescences solitary Back to 156 | 159 |
158 | Calyptra scar present | Eucalyptus squamosa |
| Calyptra scar absent Back to 157 | Eucalyptus fastigata |
159 | Juvenile leaves linear | 160 |
| Juvenile leaves broad-lanceolate or broader Back to 157 | 163 |
160 | Disc level or raised | 161 |
| Disc steeply depressed Back to 159 | Eucalyptus oleosa |
161 | Bark shedding from bases of larger branches | Eucalyptus smithii |
| Bark persisting to smaller branches Back to 160 | 162 |
162 | Adult leaves mostly >1 cm wide | Eucalyptus corticosa |
| Adult leaves mostly <1 cm wide Back to 161 | Eucalyptus nicholii |
163 | Buds glaucous | 164 |
| Buds not glaucous Back to 159 | 165 |
164 | Fruit 6–8 mm diam. | Eucalyptus malacoxylon |
| Fruit 4–5 mm diam. Back to 163 | Eucalyptus nova-anglica |
165 | Juvenile leaves green | 166 |
| Juvenile leaves blue Back to 163 | 168 |
166 | Fruit >5 mm diam. | Eucalyptus angophoroides |
| Fruit <5 mm diam. Back to 165 | 167 |
167 | Fruit conical | Eucalyptus aggregata |
| Fruit hemispherical or rounded Back to 166 | Eucalyptus acaciiformis |
168 | Juvenile leaves orbiculate | 169 |
| Juvenile leaves narrow-elliptic Back to 165 | Eucalyptus ignorabilis |
169 | Fruit >5 mm long | Eucalyptus bridgesiana |
| Fruit <5 mm long Back to 168 | Eucalyptus nova-anglica |
170 | Valves of fruit enclosed | 171 |
| Valves of fruit exserted Back to 1 | 228 |
171 | Inflorescences compound | 172 |
| Inflorescences simple Back to 170 | 174 |
172 | Fruit conical or ovoid | 173 |
| Fruit hemispherical Back to 171 | Eucalyptus michaeliana |
173 | Stamens regularly inflexed, outer whorls infertile | Eucalyptus polyanthemos |
| Stamens irregularly flexed, all fertile Back to 172 | Eucalyptus dawsonii |
174 | Fruit sessile | 175 |
| Fruit pedicellate Back to 171 | 193 |
175 | Inflorescences 3-flowered | 176 |
| Inflorescences 7-flowered or more Back to 174 | 180 |
176 | Adult leaves often opposite | 177 |
| Adult leaves disjunct Back to 175 | 179 |
177 | Opposite pairs of juvenile leaves fused at base | Eucalyptus perriniana |
| Juvenile leaves free Back to 176 | 178 |
178 | Adult leaves <10 mm wide | Eucalyptus recurva |
| Adult leaves >10 mm wide Back to 177 | Eucalyptus pulverulenta |
179 | Fruit cylindrical or ovoid, disc flat or depressed; juvenile leaves | Eucalyptus glaucescens |
| Fruit campanulate, disc slightly raised; juvenile leaves <4 cm long and wide Back to 176 | Eucalyptus saxatilis |
180 | Trees | 181 |
| Mallee Back to 175 | 187 |
181 | Calyptra scar present | Eucalyptus nitens |
| Calyptra scar absent Back to 180 | 182 |
182 | Buds in stellate clusters | 183 |
| Buds not in stellate clusters Back to 181 | 184 |
183 | Juvenile leaves elliptic or orbiculate | Eucalyptus stellulata |
| Juvenile leaves narrow-elliptic Back to 182 | Eucalyptus copulans |
184 | Adult leaf venation subparallel | 185 |
| Adult leaves with a distinct midrib Back to 182 | 186 |
185 | Fruit angular | Eucalyptus debeuzevillei |
| Fruit not angular Back to 184 | Eucalyptus niphophila |
186 | Fruit broader than long; juvenile leaves green | Eucalyptus kybeanensis |
| Fruit longer than broad; juvenile leaves blue Back to 184 | Eucalyptus oreades |
187 | Adult leaves often opposite | Eucalyptus sturgissiana |
| Adult leaves disjunct Back to 180 | 188 |
188 | Buds in stellate clusters | 189 |
| Buds not in stellate clusters Back to 187 | 192 |
189 | Juvenile leaves ovate to elliptic | Eucalyptus latiuscula |
| Juvenile leaves linear to lanceolate Back to | 190 |
190 | Juvenile leaves lanceolate, adult leaves often >1 cm wide | Eucalyptus dissita |
| Juvenile leaves linear to narrow-lanceolate, adult leaves <1 cm wide Back to 189* | 191 |
191 | Adult leaves <6 cm long | Eucalyptus moorei |
| Adult leaves often >6 cm long Back to 190 | Eucalyptus serpentinicola |
192 | Calyptra scar absent | Eucalyptus kybeanensis |
| Calyptra scar present Back to 188 | Eucalyptus dumosa |
193 | Venation in adult leaves subparallel | 194 |
| Venation in adult leaves not subparallel Back to 174 | 197 |
194 | Mallees; leaves lanceolate or narrower | Eucalyptus gregsoniana |
| Trees; leaves lanceolate to ovate Back to 193 | 195 |
195 | Internodes often >3 cm long | Eucalyptus lacrimans |
| Internodes <3 cm long Back to 194 | 196 |
196 | Buds strongly glaucous | Eucalyptus niphophila |
| Buds not strongly glaucous Back to 195 | Eucalyptus pauciflora |
197 | Mallees | 198 |
| Trees Back to 193 | 213 |
198 | Adult leaves >1.5 cm wide | 199 |
| Adult leaves <1.5 cm wide Back to 197 | 205 |
199 | Adult leaves with lateral veins strongly acute (<30° to midrib) | Eucalyptus multicaulis |
| Adult leaves with lateral veins 30–50° to midrib Back to 198 | 200 |
200 | Disc flat | Eucalyptus luehmanniana |
| Disc depressed Back to 199 | 201 |
201 | Buds glaucous | Eucalyptus stenostoma |
| Buds not glaucous Back to 200 | 202 |
202 | Twigs winged | Eucalyptus langleyi |
| Twigs not winged Back to 201 | 203 |
203 | Juvenile leaves dull, subglaucous; adult leaves to 3.5 cm wide | Eucalyptus burgessiana |
| Juvenile leaves glossy green; adult leaves to 2.5 cm wide Back to 202 | 204 |
204 | Fruit 8–11 mm diam. | Eucalyptus obstans |
| Fruit 3–5 mm diam. Back to 203 | Eucalyptus aenea |
205 | Disc flat | 206 |
| Disc depressed Back to 198 | 208 |
206 | Disc broad | Eucalyptus codonocarpa |
| Disc narrow Back to 205 | 207 |
207 | Leaves thick | Eucalyptus approximans |
| Leaves thin Back to 206 | Eucalyptus microcodon |
208 | Adult leaves <8 mm wide | 209 |
| Adult leaves often >8 mm wide Back to 205 | 211 |
209 | Immature adult leaves pinkish grey; longest peduncles <8 mm long | Eucalyptus cunninghamii |
| Immature adult leaves green; longest peduncles >8 mm long Back to 208 | 210 |
210 | Largest fruit >8 mm diam.; leaves usually <9 cm long, if longer then >7 mm wide | Eucalyptus laophila |
| Largest fruit <8 mm diam.; longest leaves >9 cm long and <7 mm wide Back to 209 | Eucalyptus apiculata |
211 | Fruit 3–5 mm diam. | Eucalyptus aenea |
| Fruit 6–11 mm diam. Back to 208 | 212 |
212 | Adult leaves <10 mm wide | Eucalyptus stricta |
| Adult leaves >10 mm wide Back to 211 | Eucalyptus spectatrix |
213 | Calyptra scar absent | 214 |
| Calyptra scar present Back to 197 | 223 |
214 | Disc flat | 215 |
| Disc not flat Back to 213 | 220 |
215 | Adult leaves dull | 216 |
| Adult leaves glossy Back to 214 | 218 |
216 | Tablelands and Western Slopes species | Eucalyptus rossii |
| Coastal species Back to 215 | 217 |
217 | Adult leaves <1.8 cm wide | Eucalyptus racemosa |
| Adult leaves >1.9 cm wide Back to 216 | Eucalyptus signata |
218 | Fruit >7 mm diam. | Eucalyptus haemastoma |
| Fruit <7 mm diam. Back to 215 | 219 |
219 | Coastal species north from Morisset | Eucalyptus signata |
| Sydney region, Blue Mtns and south Back to 218 | Eucalyptus sclerophylla |
220 | Fruit large (13–18 mm diam.), ribbed | Eucalyptus olsenii |
| Fruit small (4–10 mm diam.), not ribbed Back to 214 | 221 |
221 | Anthers versatile, reniform, dehiscing through confluent slits | Eucalyptus paliformis |
| Anthers adnate, dehiscing through separate slits Back to 220 | 222 |
222 | Inflorescences 3-flowered | Eucalyptus leucoxylon |
| Inflorescences 7-flowered Back to 221 | Eucalyptus melliodora |
223 | Juvenile leaves opposite for few pairs | Eucalyptus ovata |
| Juvenile leaves opposite for many pairs Back to 213 | 224 |
224 | Buds rounded, outer calyptra not shedding cleanly | Eucalyptus benthamii |
| Buds pointed, outer calyptra shedding cleanly Back to 223 | 225 |
225 | Inflorescences 3-flowered | Eucalyptus wilcoxii |
| Inflorescences 7-flowered Back to 224 | 226 |
226 | Fruit >5 mm diam. | 227 |
| Fruit <5 mm diam. Back to 225 | Eucalyptus dorrigoensis |
227 | Buds 4–5 mm diam. | Eucalyptus cypellocarpa |
| Buds 2.5–3.5 mm diam. Back to 226 | Eucalyptus oresbia |
228 | Calyptra >1.5 times as long as hypanthium | 229 |
| Calyptra <1.5 times as long as hypanthium Back to 170 | 244 |
229 | Buds glaucous | 230 |
| Buds not glaucous Back to 228 | 232 |
230 | Disc domed, >1.5 mm wide | Eucalyptus glaucina |
| Disc ± flat, <1.5 mm wide Back to 229 | 231 |
231 | Calyptra cylindrical | Eucalyptus prava |
| Calyptra conical Back to 230 | Eucalyptus dealbata |
232 | Calyptra cylindrical | Eucalyptus bancroftii |
| Calyptra conical or rostrate Back to 229 | 233 |
233 | Calyptra rostrate | Eucalyptus camaldulensis |
| Calyptra conical Back to 232 | 234 |
234 | Calyptra >2.5 times as long as hypanthium | 235 |
| Calyptra 1.5–2 times as long as hypanthium Back to 233 | 239 |
235 | Inflorescences >7-flowered | Eucalyptus amplifolia |
| Inflorescences 7-flowered Back to 234 | 236 |
236 | Seeds black | 237 |
236 | Seeds red | 238 |
237 | Fruit >6 mm in diam. | Eucalyptus tereticornis |
| Fruit <6 mm in diam. Back to 236 | Eucalyptus blakelyi |
238 | Fruit >5 mm long, adult leaves lanceolate | Eucalyptus interstans |
| Fruit <5 mm long, adult leaves narrow-lanceolate Back to 236 | Eucalyptus seeana |
239 | Juvenile leaves ovate to orbiculate | 240 |
| Juvenile leaves narrow-lanceolate to lanceolate Back to 234 | 242 |
240 | Mallees | 241 |
| Trees Back to 239 | Eucalyptus chloroclada |
241 | Adult leaves penniveined, glossy; coastal species | Eucalyptus pumila |
| Adult leaves with open venation, dull; inland plains species Back to 240 | Eucalyptus vicina |
242 | Trees; seeds red | Eucalyptus parramattensis |
| Mallees; seeds black Back to 239 | 243 |
243 | Fruit >5 mm diam. | Eucalyptus dwyeri |
| Fruit <5 mm diam. Back to 242 | Eucalyptus nandewarica |
244 | Inflorescences 3-flowered | 245 |
| Inflorescences 7- or more-flowered Back to 228 | 253 |
245 | Fruit >10 mm diam. | 246 |
| Fruit <10 mm diam. Back to 244 | 247 |
246 | Peduncles >3 mm long | Eucalyptus pseudoglobulus |
| Peduncles <3 mm long Back to 245 | Eucalyptus bicostata |
247 | Juvenile leaves broad lanceolate to ovate, to orbiculate or elliptic | 248 |
| Juvenile leaves lanceolate Back to 245 | 252 |
248 | Buds glaucous | 249 |
| Buds not glaucous Back to 247 | 250 |
249 | Juvenile stems rounded | Eucalyptus rubida |
| Juvenile stems markedly quadrangular Back to 248 | Eucalyptus canobolensis |
250 | Juvenile leaves grey | Eucalyptus dalrympleana |
| Juvenile leaves green Back to 248 | 251 |
251 | Calyptra as wide as hypanthium | Eucalyptus imlayensis |
| Calyptra narrower than hypanthium Back to 250 | Eucalyptus baeuerlenii |
252 | Calyptra narrower than hypanthium | Eucalyptus wilcoxii |
| Calyptra as wide as hypanthium Back to 247 | Eucalyptus viminalis |
253 | Adult leaves discolorous | 254 |
| Adult leaves concolorous Back to 244 | 262 |
254 | Disc raised or ± level | 255 |
| Disc depressed Back to 253 | 259 |
255 | Fruit >10 mm diam. | Eucalyptus canaliculata |
| Fruit <10 mm diam. Back to 254 | 256 |
256 | Valves apiculate, vertically raised | Eucalyptus major |
| Valves obtuse, incurved Back to 255 | 257 |
257 | Fruit <6 mm diam. | Eucalyptus propinqua |
| Fruit 6–10 mm diam. Back to 256 | 258 |
258 | Calyptra narrower than hypanthium | Eucalyptus biturbinata |
| Calyptra as wide as hypanthium Back to 257 | Eucalyptus punctata |
259 | Buds glaucous, valves broad-triangular, incurved | Eucalyptus grandis |
| Buds not glaucous Back to 254 | 260 |
260 | Adult leaves lanceolate; valves narrow-acuminate | Eucalyptus saligna |
| Adult leaves broad-lanceolate or broader; valves triangular, acute Back to 259 | 261 |
261 | Calyptra rounded, pedicels <4 mm long | Eucalyptus brunnea |
| Calyptra pointed, pedicels >4 mm long Back to 260 | Eucalyptus deanei |
262 | Adult leaves often opposite, <3 cm long | Eucalyptus parvula |
| Adult leaves disjunct, >3 cm long Back to 253 | 263 |
263 | Inflorescences usually paired in leaf axils | Eucalyptus pachycalyx |
| Inflorescences solitary in leaf axils Back to 262 | 264 |
264 | Adult leaves broad-lanceolate or broader | 265 |
| Adult leaves lanceolate or narrower Back to 263 | 267 |
265 | Adult leaves rounded or mucronate | 266 |
| Adult leaves acute Back to 264 | Eucalyptus ovata |
266 | Petioles 6–11 mm long; adult leaves 1.2–3.5 cm wide; peduncles 3–9 mm long | Eucalyptus aquatica |
| Petioles 10–20 mm long; adult leaves 3.0–5.0 mm wide; peduncles 10–18 mm long Back to 265 | Eucalyptus camphora |
267 | Bark shed in long ribbons | 268 |
| Bark shed in scales Back to 264 | 275 |
268 | Juvenile leaves ovate or broader | 269 |
| Juvenile leaves lanceolate Back to 267 | 272 |
269 | Buds glaucous | 270 |
| Buds not glaucous Back to 268 | 271 |
270 | Calyptra finely warty, apiculate | Eucalyptus maidenii |
| Calyptra smooth, not apiculate Back to 269 | Eucalyptus rubida |
271 | Adult leaves apparently finely toothed; outer calyptra not shedding cleanly | Eucalyptus denticulata |
| Adult leaves entire; outer calyptra shedding cleanly Back to 269 | Eucalyptus dalrympleana |
272 | Calyptra scar present | 273 |
| Calyptra scar absent Back to 268 | 274 |
273 | Buds 4–7 mm long; pedicels 1–4 mm long | Eucalyptus nobilis |
| Buds 9–13 mm long; pedicels <2 mm long Back to 272 | Eucalyptus quinniorum |
274 | Calyptra hemispherical | Eucalyptus kybeanensis |
| Calyptra conical, acute Back to 272 | Eucalyptus deuaensis |
275 | Juvenile leaves linear or lanceolate | 276 |
| Juvenile leaves broad lanceolate to ovate, elliptic or orbiculate Back to 267 | 279 |
276 | Trees | 277 |
| Mallees Back to 275 | 278 |
277 | Bark irregularly shedding, patchy, not powdery | Eucalyptus parramattensis |
| Bark clean or lightly mottled, powdery Back to 276 | Eucalyptus mannifera |
278 | Fruit >5 mm diam. | Eucalyptus dwyeri |
| Fruit <5 mm diam. Back to 276 | Eucalyptus nandewarica |
279 | Mallees | 280 |
| Trees Back to 275 | 281 |
280 | Adult leaves penniveined, glossy; coastal species | Eucalyptus pumila |
| Adult leaves with open venation, dull; inland plains species Back to 279 | Eucalyptus vicina |
281 | Juvenile leaves disjunct | Eucalyptus chloroclada |
| Juvenile leaves opposite for >10 nodes Back to 279 | 282 |
282 | Juvenile leaves not crenate | 283 |
| Juvenile leaves crenate, remaining opposite for several years Back to 281 | Eucalyptus dunnii |
283 | Fruit <5 mm long and <5 mm in diam. | 284 |
| Fruit 5 mm long and 5 mm in diam. or more Back to 282 | 285 |
284 | Buds acute; outer calyptra shedding cleanly | Eucalyptus dorrigoensis |
| Buds rounded; outer calyptra not shedding cleanly Back to 283 | Eucalyptus benthamii |
285 | Fruit 5–6 mm long | Eucalyptus praecox |
| Fruit 6–8 mm long Back to 283 | Eucalyptus elliptica |