Acacias of Australia

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Acacia filamentosa Maslin




Known from only a few localities in the Kimberley region, W.A., e.g. Adcock Gorge and between Pentecost Downs Stn and Kalumburu.


Shrub to 2 m high, glabrous. 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; nerves c. 8, distant, impressed, very obscure, sometimes resinous. 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-nerved. 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.


Grows on sandstone hills.


W.A.: Adcock Gorge, A.S.Ingram W381 (NSW); 33.8 km SW of Kalumburu Mission, N.H.Speck 4923 (NSW, PERTH).


Relationships obscure, but perhaps related to A. orthocarpa (also from the Kimberley region) which has generally shorter phyllodes with obvious, circular stomata, smaller flowers and woody pods. Acacia kimberleyensis has similarly long phyllodes.

FOA Reference

Data derived from Flora of Australia Volumes 11A (2001), 11B (2001) and 12 (1998), products of ABRS, ©Commonwealth of Australia