Ptychosema pusillum Benth. Dwarf Pea
Lindl., Sketch Veg.Swan R. 16 (1839)

Conservation Code: Threatened Flora (Declared Rare Flora — Extant)
Naturalised Status: Native to Western Australia
Name Status: Current

Brief Description
Grazyna Paczkowska, Wednesday 31 July 1996

Perennial, herb, mostly 0.05-0.1 m high. Fl. red & brown & yellow, Aug to Oct. Sand. Rises.


Beard’s Provinces: South-West Province.

IBRA Regions: Geraldton Sandplains, Swan Coastal Plain.

IBRA Subregions: Dandaragan Plateau, Lesueur Sandplain, Perth.

Local Government Areas (LGAs): Dandaragan, Gingin.

Scientific Description
C. Hollister and K.R. Thiele, Friday 4 September 2020

Prostrate,spreading or scrambling, herb. Stems terete, not spiny, hairy; pustules or glands absent. Leaves or phylloclades clearly present, compound, alternate, continuous with stem, 15-35 mm long, hairy, with simple hairs, flat with flat margins; margins entire; tubercles absent, leaflets 5-13, pinnately arranged, terminal leaflet present, stalked; pustules or glands absent. Stipules apparently absent even from the youngest leaves, 7.5 mm long, without glands, ribless. Pedicel present, 4-4.5 mm long, hairy. Bracteoles present and persistent. Calyx 7-8 mm long, not accrescent, hairy, with simple hairs, ribless; pustules or glands absent. Corolla 10-19 mm long, multicoloured, mostly yellow, red or brown, with some yellow, red or brown spots, streaks or blotches; claws present; standard 10-17.5 mm long, glabrous, not auriculate, wings 9-11.5 mm long, not auriculate, keel 8-9 mm long, not beaked, not auriculate, hairy at least in part. Stamens ten; anthers 0.5-0.7 mm long, at two different levels (filaments alternately long and short), 3-6 mm long. Ovary sessile or subsessile, hairy or glandular; style 5-6.5 mm long, hairy or glandular towards the base, not bearded, terete. Fruit dehiscent (a pod or follicle), sessile or subsessile, flat or compressed, not beaked. Flowers in August, September and October. Occurs in the South-West Botanical Province, in the Geraldton Sandplains and Swan Coastal Plain IBRA regions. Conservation Code Threatened (T).