Common name: river wattle
Acacia subporosa F.Muell. APNI*
Synonyms: Racosperma subporosum (F.Muell.) Pedley APNI*
Description: Erect or spreading tree or shrub 4–12 m high, the branches often ± weeping; bark smooth, grey or brown; branchlets with low longitudinal green to brown ridges alternating with ± resinous bands (later terete with ridges), often sticky, glabrous.
Phyllodes usually narrowly elliptic to very narrowly elliptic, straight to slightly curved, 4–12 cm long, 4–11 mm wide (sometimes 3 mm or more wide), dotted with resin glands, often sticky, glabrous with margins ± appressed-hairy, 2–5 main longitudinal veins with minor longitudinal and lateral veins between, apex acute or subacute; 1 inconspicuous gland at base; pulvinus < 2 mm long.
Inflorescences simple, 1–3 in axil of phyllodes; peduncles 4–11 mm long, finely ± appressed-hairy; heads globose, 16–25-flowered, 5–9 mm diam., pale yellow.
Pods ± straight, ± flat but slightly raised over seeds, straight-sided or slightly constricted between some seeds, 3–10 cm long, 4–5 mm wide, firmly papery, glabrous, resinous; seeds longitudinal; funicle expanded towards seed.
Flowering: mainly July–October, sometimes through to summer.
Distribution and occurrence: south from Bodalla area.
Grows in gullies in wet sclerophyll forest, in sandy and shaley soils, on conglomerates and basalt.
NSW subdivisions: SC
Other Australian states: Vic.
The name refers to the small oil glands on the phyllodes. Very closely related to Acacia cognata which has narrower and longer phyllodes and fewer flowers per head, and possibly intergrades with it.
Text by P.G. Kodela (December 2005)
Taxon concept: P.G. Kodela & G.J. Harden, Flora of NSW Vol. 2 (2002)
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