Indigofera australis Willd. Australian Indigo
Sp.Pl. 3:1235 (1802)

Conservation Code: Not threatened
Naturalised Status: Native to Western Australia
Name Status: Current

Brief Description
Grazyna Paczkowska, Wednesday 19 June 1996

Erect, spreading shrub, 0.3-2 m high. Fl. pink-purple-red, Jul to Sep. Sandy soils over granite or sandstone. Granite plains & outcrops, river flats.

Distribution

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

IBRA Regions: Avon Wheatbelt, Coolgardie, Esperance Plains, Geraldton Sandplains, Mallee.

IBRA Subregions: Avon Wheatbelt P1, Eastern Goldfield, Eastern Mallee, Fitzgerald, Geraldton Hills, Mardabilla.

Local Government Areas (LGAs): Dundas, Esperance, Mingenew, Northampton, Ravensthorpe.

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

Erect, shrub, spindly shrub (broom-like). Stems terete, not spiny, glabrous; pustules or glands absent. Leaves or phylloclades clearly present, compound, alternate, not continuous with stem, 25-75 mm long, hairy, with simple hairs, flat with recurved margins; margins entire; tubercles absent, leaflets 17-25, pinnately arranged, terminal leaflet present, stalked; pustules or glands absent. Stipules present and persistent to older leaves. Pedicel present, 2.8-3.5 mm long, hairy. Bracteoles present but early deciduous. Calyx 3-3.4 mm long, not accrescent, hairy, with simple hairs, ribless; pustules or glands absent. Corolla 7.5-8.5 mm long, multicoloured, mostly pink, red or purple, with some pink, red or purple spots, streaks or blotches; claws absent; standard 6.7-8 mm long, glabrous, not auriculate, wings 6.5-7.5 mm long, not auriculate, keel 4.5-8 mm long, not beaked, not auriculate, glabrous. Stamens ten; anthers 0.6 mm long, at two different levels (filaments alternately long and short); filaments united in an open sheath with one free stamen, 3-4.5 mm long. Ovary glabrous; style 5.2-5.5 mm long, glabrous, not bearded, terete. Fruit dehiscent (a pod or follicle), 20-25 mm long, 1.7-2.5 mm wide, sessile or subsessile, not constricted between the seeds, round in cross-section, glabrous, not beaked. Flowers in July, August and September. Occurs in the Eremaean and South-West Botanical Province, in the Central Ranges, Coolgardie, Geraldton Sandplains, Avon Wheatbelt, Mallee and Esperance IBRA regions.