Gastrolobium trilobum

Gastrolobium trilobum, commonly known as bullock poison, is a flowering plant in the family Fabaceae, and is endemic to Western Australia. It is a small, rigid shrub with orange, yellow and red flowers.

Description
Gastrolobium trilobum is a spindly, spreading, prostrate shrub with needle-shaped hairy stems, some sections partly spiky. The leaves are arranged in opposite pairs, smooth, 10-35 mm long, flat, margins lobed, the pedicel 1.5-2 mm long and hairy. The calyx 5 mm long has simple hairs and the bracteoles deciduous. The flower petals are mostly red, orange or yellow with markings in either red, yellow or orange, and the corolla is 8-9.5 mm long. The standard petal is 6-7.5 mm long, the wings are 9-9.5 mm long and the keel 9-9.7 mm long and smooth. Flowering occurs from July to November and the fruit is a pod or a follicle.

Taxonomy and naming
Gastrolobium trilobum was first formally described in 1839 by John Lindley from an unpublished description by George Bentham. Lindley's description was published in A Sketch of the Vegetation of the Swan River Colony. The specific epithet (trilobum) means "lobed".

Distribution
Bullock poison grows in the Avon Wheatbelt, Jarrah Forest and mallee.