Acacia brockii Tindale & Kodela, Telopea 5: 62; 56, fig. 2 & 65, fig. 5 (1992)
Slender tree to 5 m high; foliage silver-grey at first, soon glabrous. Bark smooth, grey. Branchlets terete, angular towards apices, appressed pubescent. Phyllodes linear, flat, straight or slightly falcate, 8.5–25.6 cm long, 1.4–2.8 mm wide, with glanduliferous apex, rigid, with appressed, caducous, silvery hairs, later subglabrous and bright green, with 5–8 longitudinal veins per mm, the midvein slightly more prominent; gland basal. Peduncles 2–3 mm long, densely pubescent. Spikes single or paired, 23–43 mm long, 3.5–4.5 mm wide, pale yellow. Flowers 5-merous; calyx 0.8–0.9 mm long, cut to 1/5–1/3, appressed-puberulous ciliate; corolla 1.2–1.5 mm long, cut to 2/5–1/2, glabrous. Pods linear, raised over seeds, straight-sided, 8–11.7 cm long, 4.7–6 mm wide, papyraceous, light brown, glabrescent. Seeds longitudinal, brown; areole open.
Recorded from several localities in the southern region of Kakadu Natl Park, N.T.. Grows in crumbly red kaolinitic soil in dry Asteromyrtus heathland, in deep white sand besides permanent streams in sandstone gorges, and in skeletal soil on sandstone along streambanks in shrubland. Flowers Apr. & May.
Acacia brockii is distinguished by caducous appressed hairs on the phyllodes, ciliate bracteoles with acute apices extending beyond the flower buds, and silvery hairs on the calyces.
Type of accepted name
18.5 km S of Gimbat HS (below E edge of Marawal Plateau), Kakadu Natl Park, N.T., 21 Apr. 1990, A.V.Slee & L.A.Craven 2694 ; holo: NSW; iso: BRI, CANB, DNA, K, L, MEL, US.
Illustrations
M.D.Tindale & P.G.Kodela, loc. cit .
Representative collections
N.T.: Barramundie Gorge, J.Brock s.n. (DNA25091) and J.Brock 109 (DNA).
(MDT & PGK)
The information presented here originally appeared on the WATTLE CD-ROM which was jointly published by the Australian Biological Resources Study, Canberra, and the Department of Parks and Wildlife, Perth; it was produced by CSIRO Publishing from where it is available for purchase. The WATTLE custodians are thanked for allowing us to post this information here.
