Acacia undoolyana G.J.Leach, in G.J.Leach et al., J. Adelaide Bot. Gard . 11: 55; 56, fig. 1 57, map 1 (1988)
Shrub or tree, 1–15 m high. Bark flaky or fissured, greyish brown. Branchlets terete, pubescent, later glabrous; ridges indistinct. Phyllodes very narrowly elliptic to linear, markedly falcate, 15–22 cm long, 6–12 (–14) mm wide, with conspicuous yellowish margins, coriaceous, stiff, silvery-velvety when young, later sparsely pubescent and with dense white scurfy bloom, finely multistriate, with 1–3 nerves more prominent, not visibly anastomosing; glands 2, the apical gland prominent, the basal gland inconspicuous. Peduncles 3–6 mm long, densely pubescent. Spikes 1–4 on short, pubescent axillary axes which often grow into leafy shoots, 1.3–3.2 cm long, dense, bright yellow. Flowers 5-merous; calyx 0.7–1 mm long, dissected to 1/4–1/5, pubescent especially on ribs, with obtuse lobes; corolla twice as long as calyx, dissected to 1/2, glabrous. Pods linear, raised over and constricted between seeds, 5–11 cm long, 2–3 mm wide, sparsely pubescent. Seeds longitudinal, oblong, 3–4.5 mm long, brown.
Restricted to the East MacDonnell Ra., N.T., recorded from N’Dhala Gorge (c. 65 km E of Alice Springs), Kadaicha Ra. and 25 km SW of Trephina Gorge. Grows on steep rocky slopes with skeletal soils or at the base of sandstone gullies. Flowers Aug. & Sept.; fruits Sept. & Oct.
Closely allied to A. macdonnelliensis , being distinguished by its strongly falcate phyllodes which are longer (15–22 cm), broader (6–12 mm) and silvery when fresh. It is also related to A. ammobia which has glabrous peduncles, mostly straight phyllodes and occurs on sand dunes.
Type of accepted name
N’Dhala Gorge Nature Park, N.T., 17 Aug. 1987, G.Leach 1367 ; holo: DNA, iso: NSW, also AD, BRI, CANB, K, MEL, NT, PERTH but n.v .
Illustrations
G.J.Leach et al ., loc. cit.
Representative collections
N.T.: N'Dala [N'dhala] Gorge, 15 Oct. 1966, A.C.Beauglehole (DNA); Ndala [N'dhala] Gorge Scenic Reserve, 16 Aug. 1987, L.D.Meredith et al . (CANB n.v., MEL n.v., NSW); Kadaicha Ra., A.Soos 24 to 27 (DNA).
(NSW)
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.
