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Acacia isoneura

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Acacia isoneura Maslin & A.R.Chapm., Nuytsia 12: 478 (1999)

Rounded or obconical shrub to 3 m high. Branchlets sericeous between ribs towards apices. Phyllodes terete, 7- 12 (–14) cm long, 0.5- 1.2 mm diam., coarsely pungent, soft and flexible or rigid, green to grey-green, glabrous or subglabrous, with 8 broad, equal nerves, each separated by a shallow, narrow furrow; gland 0- 3 mm above base. Inflorescences simple, 1 or 2 per axil; heads sessile, obloid to short-cylindrical, usually 8- 15 mm long, golden. Flowers 4-merous; sepals 1/2- 3/4-united. Pods linear to submoniliform, 3- 6 cm long, 2- 2.5 mm wide, firmly chartaceous, antrorsely strigulose. Seeds longitudinal, elliptic to oblong-elliptic, 2- 3 mm long, glossy, grey-brown speckled dark brown or light brown mottled yellow; aril apical.

Occurs in the Mingenew-Three Springs area and from near Wubin to Perenjori, south-western W.A. There are two subspecies.

Closely related to A. hopperiana which is distinguished most reliably by its 10-nerved phyllodes with the (obscure) gland situated 1–6 cm above the pulvinus.

Phyllodes slender (0.5–0.6 mm diam.), soft, flexible, the nerves 0.2 mm wide; spikes mostly paired within phyllodes axils

subsp. isoneura

Phyllodes thick (0.8–1.2 mm diam.), rigid, the nerves 0.3 mm wide; spikes single within phyllode axils

subsp. nimia

 

Acacia isoneura Maslin & A.R.Chapm. subsp. isoneura

Phyllodes filiform, slender (0.5–0.6 mm diam.), soft, flexible, the nerves 0.2 mm wide. Spikes mostly paired within phyllode axils, rarely single. Seeds pale brown mottled yellow.

Occurs in the Mingenew-Three Springs area. Grows in sand.

Superficially similar to A. coolgardiensis subsp. coolgardiensis which is recognised by shorter spikes, 5-merous flowers and terete pods.

Type of accepted name

Near Mingenew [precise locality withheld for conservation reasons], W.A., 9 Aug. 1970, B.R.Maslin 728 ; holo: PERTH; iso: CANB, K, NY.

Representative collections

W.A.: near Mingenew, R.Coveny 3079 (NSW, PERTH); L.Diels 4270 (PERTH, Fragment ex B); 13 km W of Three Springs, 28 Aug. 1972, C.Chapman s.n. (PERTH).

 

Acacia isoneura subsp. nimia Maslin & A.R.Chapm., Nuytsia 12: 479 (1999)

Phyllodes thick, rigid (0.8–1.2 mm diam.), the nerves 0.3 mm wide. Spikes single within phyllode axils. Seeds grey-brown speckled dark brown.

Occurs in the Wubin-Perenjori area. Grows in sand in tall shrubland.

Similar to A. cylindrica which has 16-nerved phyllodes.

Type of accepted name

4.8 km S of Bunjil on road to Latham, W.A., 9 Aug. 1970, B.R.Maslin 740 ; holo: PERTH; iso: CANB, K.

Representative collections

W.A.: 10.5 km from Perenjori on the Three Springs rd, I.B.Armitage 372 (PERTH); 9 km S of Latham on road to Wubin, B.R.Maslin 6434 (CANB, K, MEL, PERTH).

(ARC & BRM)

WATTLE Acacias of Australia CD-ROM graphic

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.

Page last updated: Friday 13 December 2019