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.