Acacia adenogonia (Pedley) R.S.Cowan & Maslin, Nuytsia 7: 203, fig. 1 O–S (1990)
Erect to sprawling shrub 1–2 m high. Branchlets terete, usually canescent-villous, sometimes with scattered shorter, glandular hairs. Stipules persistent, subulate, partly united, to 6.5 mm long. Phyllodes sessile to subsessile, patent to inclined, inequilaterally ovate to lanceolate, straight, 5–10 mm long, 1.5–4.5 mm wide, acuminate-pungent, coriaceous, usually subglabrous to villous, with 3 or 4 distant nerves and with few anastomoses; gland often projecting beyond phyllode-margin, 2–5 mm above base. Inflorescences simple, 1 per axil; peduncles 7.5–14 mm long, usually villous; heads globular, 4–6 mm diam., 60–92-flowered, golden; bracteoles linear to narrowly lanceolate, exserted in buds. Flowers 5-merous; sepals 1/2-united. Pods linear, raised over and irregularly constricted between seeds, curved, to 8.5 cm long, 5–6.5 mm wide, thinly coriaceous, canescent-puberulous with intermixed longer, gland-tipped hairs. Seeds longitudinal, elliptic-oblong, 6–6.5 mm long, dull, brown-black; aril terminal.
Occurs in scattered populations in the West Kimberley in the Bonaparte Archipelago, the Napier and Broome Bay areas and inland at Kimberley Downs Stn, Beverley Springs Stn and Phillips Ra, W.A. Grows in sandy soil usually on sandstone in woodland.
Bentham referred to the type collection of A. adenogonia as questionably a variety of A. deltoidea , saying it might represent a distinct species.
The available material appears to indicate two forms comprising the species, one along the north coast of W.A. and the nearby offshore islands (see fig. 1Q–S in R.S.Cowan & B.R.Maslin, loc. cit. ), the other along the Gibb R. Rd in the area of Beverley Springs HS about 250 km south (see fig. 1 O–P in R.S.Cowan & B.R.Maslin, loc. cit. ). The latter population has somewhat larger phyllodes which are villous, rather than obscurely puberulous as in the coastal form. A flowering glabrous variant is found W of Rankin Is., Collier Bay ( K.F.Kenneally 10521 , PERTH).
Closely related to A. deltoidea which has differently shaped, thicker phyllodes, different branchlet pubescence, non-exserted phyllode glands and broader pods with oblique-transversely oriented seeds; its seed orientation is more like that of A. sublanata which has phyllodes broadest at or above the middle and a cupular calyx. Also related to A. froggattii .
Type of accepted name
Greville Is., W.A., A.Cunningham s.n. ; holo: K; ?iso: BM, PERTH.
Synonymy
Racosperma adenogonium Pedley, Austrobaileya 2: 316 (1987), based on the following: Acacia deltoidea var. pungens Benth. (as ‘deltoiden’), London J. Bot. 1: 333 (1842). Type: as for accepted name.
Illustrations
L.Pedley, op. cit. 317, fig. 1E- I; R.S.Cowan & B.R.Maslin, loc. cit .
Representative collections
W.A.: Gibb R. Rd, 1.5 km W of Lennard R. Gorge turn-off, G.W.Carr 4115 & A.C.Beauglehole 47893 (BRI, CANB, K, MEL, PERTH); Pim Hill, E.A.Chesterfield 385 (PERTH); Naturalist Is. in Prince Frederick Harbour, W of entrance to Hunter R., K.F.Kenneally 9926 (PERTH).
(RSC)
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.
