Acacia olsenii Tindale APNI* Synonyms: Racosperma olsenii (Tindale) Pedley APNI*
Description: Tall shrub to tree 3–15 m high; bark smooth or sometimes finely fissured, grey-green, dark brown or ± black; branchlets terete but often somewhat flattened towards apices, usually glabrous and pruinose.
Leaves with petiole 1.3–3.5 cm long, with 1 prominent gland at base of or to 7 mm below lowest pair of pinnae (rarely absent or 2 glands); rachis 4.5–10 cm long, glabrous or upper surface sparsely hairy, jugary glands present, interjugary glands absent or irregularly 1–4 smaller glands between some or most pairs of pinnae; pinnae 9–17 pairs, 3.5–8.3 cm long; pinnules 50–106 pairs, ± oblong to narrowly oblong-lanceolate, 1–2.2 mm long, 0.4–0.5 mm wide, appressed-ciliolate.
Inflorescences in terminal and axillary racemes and panicles; peduncles 2–6 mm long, glabrous; heads globose, 7–12-flowered, 4–6 mm diam., bright yellow.
Pods straight to curved, ± flat, raised alternately over seeds, usually slightly constricted between seeds, 2.5–12 cm long, usually 6–9 mm wide (rarely to 12 mm wide), thinly leathery, glabrous, ± pruinose; seeds longitudinal; funicle filiform.
Flowering: autumn.
Distribution and occurrence: escarpment ranges in the Tuross River area. Grows in sclerophyll communities on dry rocky scree slopes.
NSW subdivisions: ST
Named after Ian Sinclair Olsen, a former landscape designer at the Royal Botanic Gardens, Sydney.
Text by P.G. Kodela (last edited May 2012)
Taxon concept: P.G. Kodela & G.J. Harden, Flora of NSW Vol. 2 (2002)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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