Acacia pygmaea

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General Plant Info

Acacia pygmaea, previously knows as Acacia sp. Wongan Hills, known as "Dwarf Rock Wattle", is an erect single stemmed shrub, 0.3-0.7 m high, with cream-white globular flower heads that change to orange with ageing.

The species produces relatively few fruits and each pod contains 2–3 seeds. Most acacias fruit and shed their seed a short time after flowering, but the pods of this species take a year to mature. Flower buds and unopened pods may be found on the plant simultaneously (Holland et al., 1997).

Listed as Endangered (Wildlife Conservation Act 1950 (Western Australia): September 2013) as Acacia pygmaea

Geographic distribution

Known only from the Wongan Hills area, 200 km NE of Perth, in SW WA (Maslin 1995a; Holland et al. 1997; Brown et al. 1998). It is found on three adjacent ridges (Orchard & Wilson 2001) around Mt Matilda and Mt O'Brien, representing a geographic range of 8 km (Holland et al. 1997; Brown et al. 1998).

Only a few populations are known despite numerous searches and an abundance of suitable habitat. It occurs in Mt Matilda NR, Rogers NR and on private property

Beard’s Provinces: South-West Province.

IBRA Regions: Avon Wheatbelt.

IBRA Subregions: Avon Wheatbelt P2.

Local Government Areas (LGAs): Wongan-Ballidu


Dwarf, glabrous subshrub 0.3–0.5 m high. Branchlets prominently ribbed. Stipules shallowly triangular, c. 0.5 mm long.

Phyllodes crowded, erect, elliptic to obovate, 20–30 mm long, 9–13 mm wide, obtuse, thin, green, 1-nerved or imperfectly 2-nerved; lateral nerves few and obscure; gland not prominent, 4–7 mm above base.

Inflorescences simple, mostly 1 per axil; peduncles 4–7 mm long; heads globular, 3- or 4-flowered, white, drying orange; buds 4-angled. Flowers 4-merous, large; sepals 1/5 length of corolla, united into a truncate to sinuolately lobed calyx.

Pods retrorse by a strongly recurved stipe, narrowly oblong, acute, to 30 mm long, 3–4 mm wide, crustaceous; margins thick.

Seeds longitudinal, oblong to elliptic, 4–5 mm long, shiny, dark brown, arillate. Seed has been collected in late October (Maslin, 1995).

Alkaloid content


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