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Genus Asterolasia Family Rutaceae

Description: Erect or prostrate shrubs, with stellate hairs, unarmed.

Leaves alternate, simple, margins entire.

Inflorescences axillary or terminal, cymose, umbel-like. Flowers bisexual, mostly 5-merous, rarely some flowers 4- or 6-merous in some species. Sepals 5, minute, free. Petals 5, free, glabrous inside, stellate-hairy outside, not persistent in fruit. Stamens 10 to 25, free, divergent, slightly shorter than petals; anthers with or without a small terminal gland. Carpels 5, fused to the middle or nearly to the apex, usually with a beak formed from the sterile apex of the carpel; styles fused, arising at or above the middle of the carpels; stigma peltate; ovules 2 in each carpel.

Fruit of 1–5 cocci; cocci stellate-hairy or glabrous; seeds released forcibly from dehiscing cocci, dull, black.


Distribution and occurrence: World: c. 20 spp., endemic Aust., N.S.W., Vic., S.A., W.A.

Text by G.J Harden & B.J. Mole
Taxon concept:

 Key to the species 
1Flowers white to pale yellow, pedicellate, in 1–9-flowered clusters; leaves mostly >3 cm long, 5–30 mm wide, flat.2
Flowers usually bright yellow, sessile or pedicellate, solitary or in few-flowered clusters; leaves usually <3 cm long, 2–10 mm wide, with margins slightly recurved to revolute.5
2Leaves with apex acuminate; petals 8–14 mm long.Asterolasia elegans
Leaves with apex obtuse to acute; petals 5–9 mm long.
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3
3Leaves with upper surface glabrous at maturity, lower surface stellate-tomentose.Asterolasia correifolia
Leaves with both surfaces stellate-tomentose at maturity.
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4
4Petals 7–9 mm long; flowers 1-few in terminal or axillary clusters, pedicels 5–20 mm long, lengthening up to 30 mm in fruit; branchlets rusty-tomentose.Asterolasia hexapetala
Petals c. 6 mm long; flowers solitary in axils of leaves, pedicels 2–7 mm long, scarcely lengthening in fruit.; branchlets fawnish tomentose.
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Asterolasia beckersii
5Leaves narrow-oblong to oblong-cuneate (length:breadth ratio of 5–8:1), upper surface muricate, margins recurved.Asterolasia rivularis
Leaves variable in shape, elliptic to spathulate, ± circular or obcordate to obdeltate (length: breadth ratio of 1–3:1), upper surface glabrous or stellate hairy, margins recurved or flat.
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6
6Flowers 1-few, pedicels 2- 20 mm long at flowering; cocci beaked; from Torrington, Mt Kaputar N.P. and Mt Parlour (Armidale district), Mt Canobolas and Tumut to Geehi (NT, CT, ST).7
Flowers solitary, sessile or subsessile; cocci rounded or beaked; south from the Mt Tomah district in the Blue Mtns (SC, CT, ST).
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8
7Leaves obcordate to obdeltate, 7–20 mm long, upper surface densely stellate, shortly petiolate (<2 mm) or sessile; petiole when present somewhat thickened and flat, often appressed to the stem; Mt Kaputar N.P. and Mt Canobolas (NT, CT).Asterolasia rupestris
Leaves ± lanceolate to elliptic or oblanceolate, sometimes narrow-oblong, 4–35 mm long, upper surface sparsely or densely stellate; petiole terete, 2–7mm long, not appressed to the stem; base of lamina often v-shaped on upper surface giving the appearance of an extended petiole; Tumut district to Geehi and near Torrington (NT, ST).
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Asterolasia asteriscophora
8Leaves mostly 5–18 mm long; ovary glabrous; restricted to the Mt Tomah area of the Blue Mtns (CT).Asterolasia buxifolia
Leaves usually 3–10 mm long; ovary stellate-tomentose; south from the Penrose area.
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9
9Leaves elliptic to circular, with margins recurved/revolute, upper surface glossy, glabrous or sparsely stellate hairy or hispidulous; cocci not beaked; south from the A.C.T and the Budawang Ra. (SC, ST).Asterolasia trymalioides
Leaves broad-obovate, with margins not recurved, upper surface dull, glabrous or sparsely stellate hairy; cocci beaked; confined to the Wingello district (CT).
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Asterolasia buckinghamii

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