Acacia filamentosa Maslin, Nuytsia 4: 370, figs 2 & 6 (1983)
Glabrous shrub to 2 m high. Branchlets sometimes resinous. Phyllodes ascending, coarsely filiform, curved to shallowly sinuous, terete, 15–20 (–25) cm long, c. 1 mm diam., callose-acute, innocuous, not rigid, with c. 8 distant, impressed, very obscure, sometimes resinous veins. Inflorescences simple, 2 per axil; peduncles 5–15 mm long; spikes 20–25 mm long, 6 mm diam., densely flowered. Flowers 5-merous; sepals united to near apex, with broadly triangular lobes; petals 1-veined. Pods linear, slightly raised over and constricted between seeds, to 11 cm long, 3 mm wide, crustaceous to thin-coriaceous, longitudinally striate, glabrous. Seeds (immature) longitudinal, narrowly oblong, 6–7 mm long, brown with yellowish peripheral band; aril turbinate, pale yellowish.
Known from only a few localities in the Kimberley region, W.A., e.g. Adcock Gorge (c. 300 km SW of Wyndham), and between Pentecost Downs Stn (c. 150 km SW of Wyndham) and Kalumburu. Grows on sandstone hills.
Relationships obscure, but perhaps related to A. orthocarpa (also from the Kimberley region) which has punctulate, generally shorter phyllodes, smaller flowers and woody pods. Acacia kimberleyensis has similarly long phyllodes.
Type of accepted name
Gibb R. road near Ellenbrae turn-off, W.A., 25 Aug. 1980, P.Luscombe s.n. ; holo: PERTH; iso: K, PERTH.
B.R.Maslin, Nuytsia 4: 372, fig. 2 (1983).
W.A.: Adcock Gorge, A.S.Ingram W381 (NSW); 33.8 km SW of Kalumburu Mission, N.H.Speck 4923 (NSW, PERTH).