Difference between revisions of "Acacia dissona"

Revision as of 13:12, 11 January 2015

General Plant Info

Low-domed to narrowly obconic, dense shrubs 0.5-2 m tall, branches often ± contorted. Bark light grey, finely longitudinally fissured at base of trunk, smooth on branches. Branchlets more or less ridged, with very short, appressed, straight to shallowly-curved hairs. Stipules persistent, triangular. Phyllodes sub-terete or terete, 2-4 cm long, 1-1.5 mm wide, l:w = 15-30, rigid, inclined to erect, straight or nearly so, green, glabrous or pulvinus often puberulous adaxially; apex more or less sharply pungent or only mucronate to mucronulate; nerves numerous, closely parallel, raised, sometimes paler than inter-nerve spaces; stomata raised in inter-nerve spaces, sometimes appearing as tubercles; pulvinus 0.5-2 mm long, sometimes not well differentiated, usually expanded at base; gland small, near middle of blade on adaxial surface. Peduncles 2 in each axil, 2-4(5) mm long, glabrous; heads globular, golden, 5-6 mm diam. (fresh), 3-4 mm diam. (dry), 15-20-flowered; bracteoles linear. Flowers 5-merous. Sepals c. 1/2 as long as petals, free, linear, ciliolate apically. Petals free, elliptic, glabrous. Pods linear, raised over and variably constricted between seeds, to 6 cm long and 2.5 mm wide, thin-crustaceous or thin-coriaceous, moderately curved, somewhat loosely and irregularly reticulate-nerved, ± appressed-puberulous. Seeds longitudinally arranged in pods, oblong-elliptic, 2.5-4.5 mm long, 1.5 mm wide, 1 mm thick, dark-brown, glossy or semi-glossy; aril terminal, conical or broadly rounded and crested, 1/2-2/3 as long as seed, pale yellow.

Flowering

Most flowering specimens have been collected in September and October, but the northern ones (from the Coorow-Wanarra area) were collected in July and August. Pods with mature seeds have been collected in December.

Phyllodes

2-4 cm long, sub-terete, contracted to short, more or less sharply pungent tips, nerves and inter-nerve spaces uniform in colour, stomata sometimes tuberculate.

Peduncles

2-5 mm long.

Pods

distinctly constricted between the seeds, sparingly appressed-puberulous

Geographic distribution

Discontinuous in southwest Western Australia in the Merredin-Southern Cross area south to near Ongerup with outliers in the Coorow-Wanarra area (c. 250 km northwest of Merredin) and in the Norseman area (c. 350 km northeast of Ongerup).

File:Acacia dissona.gif

Identification

Alkaloid content

Other uses

Extraction

Cultivation

Grows on clay, loam, and sandy soils in eucalypt woodland or mallee, sometimes dominated by Eucalyptus salmonophloia.

Suppliers

Links

References