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Genus Acronychia Family Rutaceae

Description: Shrubs or small to large trees, with simple hairs, unarmed.

Leaves opposite, 1-foliolate or palmately 3-foliolate; leaflets with margins entire.

Inflorescences axillary, cymose or paniculate [or reduced to 1 flower]. Flowers bisexual, 4-merous. Sepals 4, free or basally fused. Petals 4, valvate, free, narrow-triangular to sublanceolate, becoming reflexed, persistent or not persistent in fruit. Stamens 8, free, divergent. Ovary 4-locular or rarely to 8-locular, with or without fissures between the locules, ± pyramidal; styles fused, arising terminally from ovary; stigma scarcely differentiated from style; ovules 2 in each loculus.

Fruit a 4-loculate (or rarely 4- to 8-loculate) drupe, with or without septicidal fissures, or rarely comprised of 4 ascending, beaked follicle-like carpels; epicarp drying semifleshy or rarely papery, or the mesocarp spongy-crustaceous to woody; seeds dull to shiny, black.


Photo © ANBG

Herbarium
Sheet

Distribution and occurrence: World: 44 spp., India, S Asia, Malesia & Pac.Is. Aust.: 19 spp. (16 spp. endemic), Qld, N.S.W., Vic.

Text by P.G. Richards & G.J Harden
Taxon concept:

 Key to the species 
1Leaves mostly 3-foliolate (rarely occasional leaves 1-foliolate).2
Leaves 1-foliolate.4
2Leaflets usually 8–20 cm long, glabrous or finely hairy, with 10–20 pairs of main lateral veins; petioles without raised corky bands.3
Leaflets mostly 4–8.5 cm long, glabrous, with 7–11 pairs of main lateral veins ; petioles of older leaves often encircled with raised corky bands.
                       Back to 1
Acronychia suberosa
3Leaflets glabrous, with 16–20 pairs of main lateral veins; fruit comprised of 4 ascending, beaked carpels, connate only at base.Acronychia octandra
Leaflets hairy on lower surface, at least on midrib and veins, with 10–13 pairs of main lateral veins; fruit drupaceous, comprised of 4 erect, ± fused carpels, not beaked.
                       Back to 2
Acronychia pubescens
4Stems, lower surface of leaves and inflorescences distinctly hairy.Acronychia pubescens
Stems, lower surface of leaves and inflorescences ± glabrous or rarely obscurely hairy.
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5
5Oil dots absent or ± invisible in leaves, sometimes translucent blotches or streaks present; fruit yellow to yellow-orange.Acronychia imperforata
Oil dots present in leaves, translucent and conspicuous; fruit white, creamy white or mauve.
                       Back to 4
6
6Petioles of young leaves at least finely hairy on upper surface; larger inflorescences <2 cm long; lower surface of leaves sometimes very sparsely and minutely hairy.Acronychia pauciflora
Petioles of young leaves glabrous; larger inflorescences >2 cm long; lower surface of leaves glabrous.
                       Back to 5
7
7Petioles 1.2–2.2 mm wide; fruit 4–8-carpellate and 4–8-lobed.8
Most petioles <1.2 mm wide; fruit 4-carpellate and 4-lobed.
                       Back to 6
9
8Oil dots in leaves moderately numerous to sparse, faintly to moderately translucent; fruit 4-lobed, glabrous, shallowly apically fissured to less than halfway; leaves strongly spicy-aromatic when crushed.Acronychia littoralis
Oil dots in leaves numerous and usually dense, strongly translucent;fruit 4–8-lobed (always some 5–8-lobed fruit present), with apical tuft of hairs, deeply fissured to more than halfway between carpels when dry, sometimes carpels fully separating in fruit; leaves not strongly aromatic when crushed.
                       Back to 7
Acronychia wilcoxiana
9Fruit mauve, drying to reddish black; leaves glossy on both surfaces.Acronychia laevis
Fruit white to greenish white or cream-coloured; leaves not glossy or glossy on upper surface only.
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10
10Petals 9–13 mm long; leaves ± elliptic, with 10–13 pairs of main lateral veins; fruit ± ovoid, 9–15 mm diam., sharply and deeply 4-angled when dry, glabrous.Acronychia baeuerlenii
Petals 5–7 mm long; leaves ± obovate, with 5–11 pairs of main lateral veins; fruit globose to depressed-globose, 8–12 mm diam., shallowly 4-lobed when dry, with apical tuft of hairs.
                       Back to 9
Acronychia oblongifolia

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