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Genus Leionema Family Rutaceae

Description: Shrubs, glabrous or with simple or stellate hairs, unarmed; branchlets smooth.

Leaves alternate, simple, glandular-punctate, margins entire or rarely toothed.

Inflorescences axillary or terminal, cymose or flowers solitary; bracteoles 2, medial on slender pedicels. Flowers bisexual, 5-merous. Sepals free. Petals 5, valvate, free or united, usually glabrous. Stamens 10, free, divergent; filaments terete, glabrous; anthers versatile, apex not glandular. Carpels 5, glabrous or stellate-hairy, apex sterile; styles fused, arising from about the middle of the carpels; stigma minutely lobed; ovules 2 in each carpel.

Fruit of 1–5 cocci; cocci not transversely ridged, with a rounded or beaked apex; seeds sub-reniform, c. 3 mm long, smooth.

Distribution and occurrence: World: 22 spp., Aust. & N.Z. Aust.: 21 spp. (endemic), Qld, N.S.W., Vic., Tas., S.A.

Refs Weston & Porteners (1991c), Wilson (1970, 1998d).

Taxa not yet included in identification key
Leionema ceratogynum,    Leionema scopulinum,    Leionema westonii

 Key to the species 
1Petals <6 mm long, ± spreading; stamens ± equal to or slightly longer than petals2
Petals >7 mm long, erect; stamens considerably exceeding petals12
2Leaves 2.5–4 cm wide, base stem-claspingLeionema ambiens
Leaves <2 cm wide, base not stem-clasping
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3Leaves hairy on lower surface4
Leaves glabrous on lower surface
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4Leaves pilose or coarsely stellate on lower surface; inflorescences terminalLeionema diosmeum
Leaves minutely white stellate-pubescent on lower surface; inflorescences axillary
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5Apex of leaves 2-toothed, leaves 2–8 cm long, margins recurved to revolute, entire to finely toothed; inflorescences >10 mm long, c. 10-floweredLeionema dentatum
Apex of leaves entire, leaves 0.8–2 cm long, margins entire; inflorescences usually <10 mm long, 1–3-flowered
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6Ovary globose, white stellate-pubescent or rarely glabrous; species of southern alpine and subalpine regions (ST)Leionema phylicifolium
Ovary narrow-ovoid, glabrous; confined to the Blue Mtns (CT)
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Leionema lachnaeoides
7Stems strongly angled, glabrous; leaves 3–7 cm long, narrow-elliptic to oblanceolate, margins finely and regularly toothed, apex acuteLeionema coxii
Stems terete to slightly angled, glabrous or hairy; leaves 0.6–5 cm long, margins usually entire or sometimes minutely erose or crenate, variously shaped
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8Inflorescences axillary, terminal peduncles absent; leaves linear to narrow-oblong or narrow-elliptic, with recurved to revolute marginsLeionema phylicifolium
Inflorescences mostly terminal, terminal peduncles present; leaves linear- to broad-spathulate or ± circular, obovate or elliptic, with flat to recurved margins
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9Leaves >13 mm long10
Leaves <13 mm long
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10Leaves spathulate to oblanceolate, obovate or oblong, 3–10 mm wideLeionema elatius
Leaves linear-oblanceolate, 2–3 mm wide
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Leionema sp. Colo River (P.H. Weston 2423)
11Stems warty, minutely hairy in longitudinal lines or all over; leaves erect to spreading, not imbricate, 2–4 mm wide.Leionema lamprophyllum
Stems not warty, minutely stellate-hairy all over; leaves erect and ± imbricate, 4–6 mm wide.
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Leionema rotundifolium
12Petals fusedLeionema sympetalum
Petals free
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13Stems glabrous, strongly angledLeionema ralstonii
Stems pilose or tomentose, ± terete
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14Leaves ± spreading, ovate to lanceolate, c. 1 cm long, obtuse; stems piloseLeionema carruthersii
Leaves ± erect, narrow-oblong to elliptic, 2–4 cm long, retuse; stems stellate-tomentose
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Leionema viridiflorum

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