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Acacia stigmatophylla

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Acacia stigmatophylla A.Cunn. ex Benth., London J. Bot . 1: 377 (1842)

Spreading, resinous shrub to 3 m high. Bark smooth, dark grey. Branchlets angular to almost flattened, red-brown or light brown, glabrous or occasionally puberulous; ridges resin-crenulated. Phyllodes narrowly elliptic or rarely oblanceolate, straight or slightly curved, 2.5–7 cm long, 6–18 (–23) mm wide, slightly oblique at base, with a small knob-like mucro at apex, with slightly undulate margins, glabrous, with 3 prominent longitudinal nerves reaching base and 2–4 subprominent parallel nerves, the minor nerves 4–6 (–8) per mm, rarely anastomosing or indistinct from fine longitudinal wrinkling when dry; gland 1, conspicuous, basal. Spikes 1.5–5 cm long, bright lemon-yellow. Flowers widely spaced, 5-merous; calyx 0.5–0.75 mm long, cupular, dissected by less than 1/5, glabrous; corolla 0.8–1.3 mm long, dissected to 1/2–2/3, the petals with prominent midrib; ovary glabrous. Pods narrowly oblanceolate, basally narrowed, flat, 2.8–7.2 cm long, 4.5–8.5 mm wide, crustaceous to thinly woody, brown, paler over seeds, obliquely reticulate, glabrous, opening elastically from apex; margins and seed-partitions thick. Seeds oblique, broadly oblong-elliptic, 4–6 mm long, brown or dark brown;areole open, depressed, dark brown; funicle-aril narrowly conical.

Occurs in tropical N.T. and W.A., N of 1730’S. Grows in stony, skeletal, sandy soils over laterite, sandstone, quartzite or granite, in monsoon forest along the coast or on the ranges in savannah grassland or eucalypt woodland. Flowers Feb., May & June.

A member of the tropical Australian ‘A. stigmatophylla group’ which also includes the spicate inflorescence species A. cataractae , A. wickhamii  and possibly A. drepanocarpa , A. oncinocarpa and other species, along with taxa with capitula including A. producta , A. stellaticeps , A. translucens , A. newmanii , A. nuperrima , A. setulifera , A. delicatula , A. manipularis , A. subternata  and A. yirrkallensis .  This group links sect. Juliflorae with sect. Plurinerves , and is characterised by being mostly resinous shrubs having branchlets with minutely resin-crenulated ridges, phyllodes with numerous closely spaced, slightly anastomosing longidudinal nerves (1–3 main nerves), flowers 5-merous, petals with a midrib, and legumes being narrowly oblanceolate tapering gradually to base, opening elastically from a hooked apex, with woody flat valves with oblique nerves and prominent margins on the outer surface and partitions between the seeds on the inner surface, fide M.D.Tindale, Telopea 2: (1980).

Type of accepted name

Brunswick Bay, North Coast, [W.A.], A.Cunningham ; holo: ?K; iso: MEL.

Illustration

J.R.Wheeler, in J.R.Wheeler (ed.) et al ., Fl. Kimberley Region 321, fig. 93F (1992).

Representative collections

W.A.: near Wren Gorge, M.Hancock 506 (CANB, NSW, PERTH); 6 miles [9.7km] W of Inglis Gap, Leopold Ra., I.V.Newman 640 (NSW); Lennard R. Falls, King Leopold Ra., W Kimberleys, 22 July 1974, J.H.Willis (MEL, NSW). N.T.: Victoria R., F.Mueller (MEL27245); Stuart Hwy, c. 29 miles [46.4 km] NW of Katherine, L.Adams 864 (CANB, NSW).

(NSW)

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: Tuesday 11 September 2018