Citation: F. Mueller, J. Proc. Linn. Soc. Bot. 3:122 (1859).

Derivation: tenuissima (L.)—most fine, slender, thin, a reference to the graceful slender parts of this species.

Synonymy: Acacia luerssenii, Acacia pityoides, Acacia xylocarpa, Racosperma tenuissimum

Common name: None

Description:
A slender erect shrub to 2.5 m high; branches reddish-brown with abundant scurfy opaque resin. Phyllodes linear, terete or slightly flattened 4-14 cm long commonly about 7-8 cm by 1 nun wide ascending, not rigid, pale green, finely striate with 6-9 veins on each side, often covered with flaky opaque resin, apex. blunt virtually straight, not pungent.

Inflorescences a simple, axillary, short spike; flower-heads oblong, bright lemon yellow, 1 cm long, peduncles 6-7 mm long, flowers 5-partite.

Legumes linear, 5-6 cm long, 2-2.5 mm wide, slightly constricted between the seeds,papery, twisted and curved when mature. Seeds longitudinal in legume, 3.5-4 x 1.5 mm black, funicle folded and thickened into a yellow aril covering the end of the seed.

Distribution:  Only recently (1989) collected in South Australia from Innamincka Station where it was found on red sandy plains. It is common in arid tropical Australia in Western Australia, Northern Territory and Queensland. S.Aust.: NW, LE. Flowering time: Not yet collected in flower in South Australia but flowering between April and August in Central Australia.

SA Distribution Map based on current data relating to specimens held in the State Herbarium of South Australia

Biology: No text

Related taxa: In South Australia it is most closely related to A. burkittii which has a more tapered fimbriate tip to the phyllode, shorter peduncle 4-paxrite flowers and longer broader pods with a white aril on the seed.

Cultivation: Not commonly in cultivation but could make an attractive slender shrub for arid areas.

Author: Not yet available

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