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Genus Homoranthus Family Myrtaceae

Description: Shrubs.

Leaves opposite, decussate, often laterally compressed, so that the leaf is thicker than wide, linear to terete to ± oblanceolate in side view.

Inflorescence consisting of single flowers in the upper leaf axils of undifferentiated shoots, or sometimes flowers condensed into a corymbose head or a 1–4-flowered axillary pseudoinflorescence; flowers enclosed by 2 bracteoles in bud, caducous or persisting until flower opens. Flowers 5-merous, yellow or white to orange or red. Hypanthium extending above the ovary; mostly 5-ribbed. Sepals undivided or with 2–12 slender laciniate lobes or projections. Stamens 10, alternating with 10 staminodes; anthers globose, opening by terminal pores. Ovary half-inferior, 1-locular, placentation basal, ovules 2–10; style projecting from flower, bearing a ring of hairs below stigma.

Fruit enclosed in hypanthium, only slightly enlarged from flower, indehiscent; seeds 1 or 2.


Distribution and occurrence: World: 31 spp., endemic Aust., Qld, N.S.W., S.A.

Text by G.J. Harden
Taxon concept: Key adapted from Copeland et al. 2011

 Key to the species 
1Flowers held erect2
Flowers pendulous14
2Sepal apex long-acuminate3
Sepal apex always laciniate, divided into 2–12 long, slender processes
                       Back to 1
10
3Peduncles 6–16 mm longHomoranthus floydii
Peduncles <4 mm long
                       Back to 2
4
4Hypanthium densely hairy between the ribs with thin, unicellular trichomesHomoranthus croftianus
Hypanthium tuberculate or smooth between the ribs, lacking thin, unicellular trichomes
                       Back to 3
5
5Hypanthium tuberculate between the ribs with broad, rounded, multicellular trichomes6
Hypanthium smooth between the ribs, multicellular trichomes absent
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8
6Plants erect, >1 m tall; petals, sepals and style creamy white; coastal speciesHomoranthus virgatus
Plants weakly erect, <0.8 m tall; petals, sepals and style yellow; inland species
                       Back to 5
7
7Hypanthium 3.4–4.7 mm long; leaves slightly glaucousHomoranthus flavescens
Hypanthium 2.0–3.2 mm long; leaves strongly glaucous
                       Back to 6
Homoranthus prolixus
8Leaf blade lunate to narrow-oblanceolate in side view, >1.1 mm thick at deepest pointHomoranthus lunatus
Leaf blade linear in side view, <1 mm thick
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9
9Plants ascending, >0.25 m tall; leaves dull, slightly glaucousHomoranthus melanostictus
Plants decumbent, <0.2 m tall; leaves shiny, never glaucous
                       Back to 8
Homoranthus bebo
10Flowers in pairs, borne on a peduncle-like internode (pseudopeduncle)11
Flowers in groups of 3 or more; flowering branchlets unmodified
                       Back to 2
12
11Leaf blade linear in side view, <1mm thickHomoranthus biflorus
Leaf blade incurved oblanceolate in side view, >1.3 mm thick
                       Back to 10
Homoranthus binghiensis
12Hypanthium densely hairy between the ribs with thin, unicellular trichomesHomoranthus croftianus
Hypanthium tuberculate or smooth between the ribs, lacking thin, unicellular trichomes
                       Back to 10
13
13Hypanthium tuberculate between the ribs; sepal apex with 3–6 laciniaeHomoranthus elusus
Hypanthium smooth between the ribs, sepal apex usually with 2–3 laciniae
                       Back to 12
Homoranthus bruhlii
14Leaves 2.5–4.5 mm long; bracteoles persistent after anthesisHomoranthus darwinioides
Leaves 5–11 mm long; bracteoles caducous
                       Back to 1
Homoranthus cernuus

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