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scattered, short gland-tipped hairs sometimes present; nerves 3 or 4 on each phyllode face; gland 1, 
situated on upper margin of phyllodcs, often projecting in short tube beyond phyllode-margin. 
Peduncles 7.5-14 mm long, solitary, villose, basally ebracteate, occasionally bracleale above 
middle; heads globular, 4-6 mm diam., 60-92-flowcred; bractcoles cxscrted in bud, linear to 
narrowly lanceolate, acuminate, ciliate. Flowers 5-merous. Sepals less than 1/2 corolla-length, 
1/2-united, ciliolale, lobes linear from ciliolate basal cup. Petals 3/4-united, lobes ovate, 
puberulous. Filaments united irregularly in fascicles at the base. Legumes linear, raised over and 
irregularly slightly constricted between seeds, 35-85 mm long, 5-6.5 mm wide, thin-coriaceous, 
curved, canescent-puberulous with intermixed longer, gland-tipped hairs. Seeds longitudinal, 
elliptic-oblong, 6-6.5 mm long, 3.5 mm wide, compressed, dull brown-black; pleurogram oblong, 
closed; aril apical. 
Other specimens examined. WESTERN AUSTRALIA: Gibb River Road, 1.5 km W of Lennard 
River Gorge turn-off, G.W. Carr 41 15 & A.C. Beauglehole 47893 (BRI, CANB, K, MEL, PERTH); 
Napier Broome Bay, 7 km S of West Bay, EA. Chesterfield 313 with S.J. Forbes & .1.11. Willis 
(PERTH); Pirn Hill, E.A. Chesterfield 385 (PERTH); [Prince] Regent River, Voyage of Bathhurst in 
1821-2, A. Cunningham 323 (PERTH, photograph of Herb. BM specimen); "Naturalist Island" in 
Prince Frederick Harbour at mouth of Hunter River, M. Evans 9 (PERTH); 0.5 km N of Pirn Hill 
between Napier Broome Bay and Vansittart Bay, 17 km NNW of Kalumburu Mission, S.J. Forbes 
2176 with J.H. Willis (PERTH); Plain Creek near Beverley Springs Homestead, NE of Derby, K.F. 
Kenneally 1988 (PERTH); "Naturalist Island" in Prince Frederick Harbour, W of entrance to Hunter 
River, K.F. Kenneally 9926 (PERTH); Gibb River Road, c. 17 miles [27.4 km] N from turnoff to Ml 
House Homestead, 24 July 1974, J.H. Willis & A.C. Beauglehole s.n. NSW, PERTH 00709255); 
Augustus Island, Bonaparte Archipelago, P.G. Wilson 10702 (PERTH) and 18 May 1972, P.G. 
Wilson s.n. (PERTH 00709263); Uwins Island, Brunswick Bay, P.G. Wilson 1 1445 (PERTH). 
Distribution. Northern Western Australia in north-west and southern extremity of Gardner 
Botanical District and north central Fitzgerald Botanical District (1:250,000 maps D51-16, D52-9 
and E51-4, 8). Occurs in scattered populations in West Kimberley, in the Bonaparte Archipelago 
and Napier Broome Bay areas and inland at Kimberley Downs Station, Beverley Springs Station 
and Phillips Range. The available material appears to indicate two populations comprising the 
species, one along the north coast of Western Australia and the nearby offshore islands, the other 
along the Gibb River road in the area of Beverley Springs Homestead, about 150 km southward. 
Habitat. Grows on sandy soil usually on sandstone in woodland. 
Flowering and fruiting periods. Flowering specimens have been collected between May and 
August, and legumes with mature seeds have been collected in July and August from plants still in 
flower. 
Conservation status. The wide distribution of this species suggests that it is probably neither rare 
nor endangered. 
Affinities. Superficially, A. adenogonia appears very similar to 4. deltoidea and they arc clearly 
related but A. adenogonia has phyllodes that arc widest below their middle, different branchlct 
pubescence (hairs shorter and mostly gland-tipped in A. deltoidea ; villose with only scattered 
gland-tipped hairs in A. adenogonia ), often cxscrted phyllode glands and narrower legumes with 
longitudinally oriented seeds. It is closer to A. froggaltii and A. sublanala with respect to 
orientation of the seeds in the pods. Bentham described it as a variety of A. deltoidea questionably, 
saying it might represent a distinct species. 
Variation. The southern population has somewhat larger phyllodes which arc villose, rather than 
obscurely puberulous as in the coastal form. We have not recognized infraspecific laxa largely 
because collections from the region between the two populations are inlrequent and we expect 
future collecting to show that these are extremes in a north to south cline, unworthy of lormal 
recognition. 
