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Acacia hamiltoniana Maiden
Family Fabaceae
Subfamily Mimosoideae
Common name: Hamilton's wattle

Acacia hamiltoniana Maiden APNI*

Synonyms: Racosperma hamiltonianum (Maiden) Pedley APNI*
Acacia obtusata var. hamiltonii Maiden APNI*
Acacia sieberiana Tausch APNI*

Description: Erect or spreading shrub 0.5–3 m high; branchlets angled towards apices and finely ridged, red-brown, glabrous.

Phyllodes narrowly elliptic to ± linear or oblanceolate, straight to slightly curved, 3–8 cm long (occasionally 2 or more cm long), 2.5–5 mm wide (some phyllodes occasionally to 6 mm wide), glabrous, ± glaucous, midvein prominent, lateral veins obscure or not evident, apex acute with a mucro; 1 inconspicuous gland 0–7 mm above pulvinus; pulvinus < 2 mm long.

Inflorescences 2–11 in an axillary raceme; axis 0.5–5 cm long; peduncles 2–4 mm long, glabrous; heads globose, 9–15-flowered, 4–5.5 mm diam., bright yellow.

Pods ± straight, ± flat except raised over seeds, ± straight-sided but often constricted between some seeds, 2–6 cm long, 7–10 mm wide, firmly papery to thinly leathery, glabrous; seeds longitudinal; funicle filiform.

Photo T.M. Tame

Photo T.M. Tame



Flowering: usually August and September.

Distribution and occurrence: from the Rylstone district to the Budawang Ra.

Grows chiefly in dry sclerophyll forest and heath, often on sandstone outcrops.
NSW subdivisions: CC, SC, CT, ST
AVH map***

Named after Arthur Andrew Hamilton (1855-1929), who had worked at the Botanic Gardens, Sydney, and collected the type at Leura in 1907. Similar in appearance to Acacia decora which has golden-hairy peduncles.

Text by P.G. Kodela (last update Mar 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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