Acacia hystrix Maslin, Nuytsia 12: 353–354 (1999)
Rounded or obconic, dense shrub normally 0.3–1 m high. Branchlets glabrous. Stipules normally caducous, inconspicuous. Phyllodes sometimes continuous with branchlet but not forming cauline wings, erect, pentagonal in section, 2–6 cm long, 1–1.7 mm diam., pungent, rigid, glabrous, glaucous to subglaucous between the 5 prominent, yellow or yellow-green, vernicose nerves. Inflorescences simple, 2 per axil; peduncles 5–15 mm long, glabrous; basal bract persistent or caducous; heads globular, 10–13-flowered, bright light golden; bracteoles variably villous with glistening hairs. Flowers 5-merous; sepals free. Pods oblong to narrowly oblong, to 2.5 cm long, 3–5 mm wide, firmly chartaceous to thinly coriaceous, declinate, glabrous. Seeds longitudinal to oblique, oblong-elliptic to oblong-obovate, 2.2–2.7 mm long, somewhat glossy, brown; aril 1/2 to fully length of seed.
Occurs from Kulin E to near L. Gilmore, south-western W.A.
Possibly related to A. tetanophylla which differs by having 7-nerved phyllodes and pods which are not declinate. Two subspecies are recognised.
Phyllodes articulate at junction with branchlet; pulvinus yellowish orange and dilated at base
Phyllodes continuous with branchlet; pulvinus absent
Acacia hystrix Maslin subsp. hystrix
Shrub normally 0.3–0.6 m high. Phyllodes articulate at junction with branchlet, 2–4.5 cm long; pulvinus dilated at base, yellowish orange but often drying light brown. Peduncles 5–10 mm long; basal bract caducous.
Occurs from Kulin E to the Bremer Ra. (c. 165 km due E of Hyden), extending N to near Southern Cross. Grows in a variety of habitats but commonly in sandy loam or clay, in open scrub or open low woodland.
Type of accepted name
1.5 miles [2.4 km] N of Kulin, W.A., 3 Aug. 1970, K.Newbey 3226 ; holo: PERTH; iso: CANB, K, MEL, PERTH.
W.A.: 6.5 km S of Kulin, B.R.Maslin 3425 (AD, BRI, NY, PERTH); Bremer Ra., B.R.Maslin 5427 (BM, CANB, MEL, MO, NSW, PERTH).
Acacia hystrix subsp. continua Maslin, Nuytsia 12: 356 (1999)
Shrub to 1 m high. Phyllodes continuous with branchlet, mostly 3–6 cm long; pulvinus absent. Peduncles 7–15 mm long; basal bract persistent.
Known only from the type locality. Grows in clay loam in Eucalyptus woodland with a dense myrtaceous understorey.
Type of accepted name
N of Salmon Gums [precise locality withheld for conservation reasons], W.A., 24 Sept. 1983, B.R.Maslin 5439 ; holo: PERTH; iso: CANB, K.
W.A.: type locality, B.R.Maslin 2462 (CANB, K, MEL, NY, PERTH).