Gastrolobium involutum G.Chandler & Crisp
Austral.Syst.Bot. 15:638,Fig.8 (2002)

Conservation Code: Priority One
Naturalised Status: Native to Western Australia
Name Status: Current

Brief Description
Amanda Spooner, Thursday 9 October 2003

Erect, spreading shrub, to 3 m high. Fl. orange, Jun to Nov. Sandy soils over granite. Base of rock outcrops, drainage channels.


Beard’s Provinces: Eremaean Province, South-West Province.

IBRA Regions: Coolgardie, Mallee.

IBRA Subregions: Eastern Mallee, Mardabilla.

Local Government Areas (LGAs): Esperance.

Scientific Description
C. Hollister and K.R. Thiele, Friday 17 January 2020

Erect or prostrate,spreading or scrambling, shrub, spindly shrub (broom-like). Stems terete, not spiny, glabrous; pustules or glands absent. Leaves or phylloclades clearly present, simple, opposite or alternate, continuous with stem, 20-40 mm long, 0.8-1 mm wide, glabrous, flat with flat margins, flat with recurved margins or strongly recurved, appearing terete but with one or two grooves below; margins entire; tubercles absent; pustules or glands absent. Stipules present and persistent to older leaves. Pedicel present, 2.5-3.3 mm long, hairy. Bracteoles present but early deciduous, striate (?) or not striate (?). Calyx 5-8 mm long, glabrous, ribbed; pustules or glands absent. Corolla 9.6-13.4 mm long, uniformly coloured, orange; claws present; standard 8.5-12.5 mm long, glabrous, auriculate, wings 7-8 mm long, auriculate, keel 6.2-8 mm long, auriculate, glabrous. Stamens ten; anthers 0.5-0.7 mm long, at two different levels (filaments alternately long and short); filaments free (or united at the very base), 3-6 mm long. Ovary stipitate, hairy or glandular; style 5-7 mm long, hairy or glandular towards the base, terete. Fruit dehiscent (a pod or follicle), stipitate, not constricted between the seeds, round in cross-section, not beaked. Flowers in June, July, August, September, October and November. Occurs in the Eremaean and South-West Botanical Province, in the Coolgardie and Mallee IBRA regions. Conservation Code Priority One (P1).