Gastrolobium celsianum

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Swan River Pea

Kingdom:	Plantae
Division:	Magnoliophyta
Class:	Magnoliopsida
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Tribe:	Mirbelieae
Genus:	Gastrolobium
Species:	G. celsianum

Binomial name

Gastrolobium celsianum
(Lemaire) G.Chandler & Crisp

Synonyms

Brachysema acuminatum Jacques
Brachysema lanceolatum Meisn.
Brachysema lanceolatum var. hypargyreum Meisn.
Brachysema lanceolatum Meisn. var. lanceolatum
Brachysema lanceolatum var. planifolium Meisn.
Brachysema speciosum Lesc.

Gastrolobium celsianum, also known as Swan River Pea, is a low-growing shrub which is endemic to south west of Western Australia.

It is a member of the family Fabaceae and of the genus Gastrolobium, which contains many toxic species, however the toxicity of this species is unknown.

The species can grow to a height of up of around 1 metre, with a spread of up to 3 metres. The red flowers, which have a distinctive long and curving keel, usually appear between August and November in Australia (late winter to late spring). The ovate leaves are glossy green above and silvery below.

The species was first formally described by botanist Charles Lemaire in 1844 and published in Horticulteur Francais as Brachysema lanceolatum. In 2002 botanists Gregory Chandler and Michael Crisp reassigned the species to the genus Gastrolobium along with other Brachysema species and gave it the current name. The variety B.l. var. glabrescens Meisn. was made a species in its own right and named Gastrolobium bracteolosum (Crisp) G.Chandler & Crisp.

Gastrolobium celsianum occurs in the south-west of the state, usually on sandy or gravelly soils along watercourses and also within mallee and woodland where it is found on flats or in moist depressions.

The species has been popular in cultivation for many years. It is tolerant of a wide range of soils but requires good drainage. Although performing best in full sun, it will tolerate light shade.