Gastrolobium propinquum is a shrub

Shrub

A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience...

 in the Fabaceae

Fabaceae

The Fabaceae or Leguminosae, commonly known as the legume, pea, or bean family, is a large and economically important family of flowering plants. The group is the third largest land plant family, behind only the Orchidaceae and Asteraceae, with 730 genera and over 19,400 species...

 family, endemic

Endemic (ecology)

Endemism is the ecological state of being unique to a defined geographic location, such as an island, nation or other defined zone, or habitat type; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, all species of lemur are endemic to the...

 to regions in Southwest Australia

Southwest Australia

Southwest Australia is a biodiversity hotspot that includes the Mediterranean forests, woodlands, and scrub ecoregions of Western Australia. The region has a wet-winter, dry-summer Mediterranean climate, one of five such regions in the world...

, which is toxic to many animals. It has been given the common name Hutt River poison.

Description

A low growing and bushy shrub, reaching 1 or 1.8 metres in height. The flowers appear from June to September in its native habitat. These are orange, yellow and red, their bracts are chestnut brown, and are held in long and slender racemes. The inflorescence

Inflorescence

An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

 extends beyond the ends of the branchlets, in an uncrowded display, and also appear at the leaf axils. The branches may be spreading, erect, or whorled, the branchlets are angled. Leaves appear in threes, are between 30 and 50 millimetres long, slightly folded along the central vein and finely pointed at the tip.

This species can only be distinguished from its near relation, Gastrolobium oxylobiodes, when the species are in flower.

Taxonomy

The species was formally described in 1955 by the state's botanist C.A.Gardner in New Species of Toxic Plants from Western Australia, published in The Western Australian Naturalist

The Western Australian Naturalist

The Western Australian Naturalist is the journal of the Western Australian Naturalists' Club. It is a peer-reviewed journal that published original research on topics related to the natural history of Western Australia...

. The epithet of the botanical name is from the Latin propinquus (closely connected), is a reference to the close relationship of the species with Gastrolobium oxylobiodes.

Distribution

This species is usually found along hills and flats, favouring drainage and seasonally wet areas. Soil types are usually clay, sandy or clay-loam, and occurrence in granite and shale. It is known to occur in two regions, specimen collections have been made in the Avon Wheatbelt

Avon Wheatbelt

Avon Wheatbelt is an Interim Biogeographic Regionalisation for Australia region in Western Australia and part of the larger Southwest Australia savanna ecoregion.-Further reading:...

 and in the Geraldton Sandplains

Geraldton Sandplains

Geraldton Sandplains is an Interim Biogeographic Regionalisation for Australia region in Western Australia and part of the larger Southwest Australia savanna ecoregion.It has two sub regions: -* Geraldton Hills sub region* Lesuer sub region...

to the west.

The species is poorly known and is given the conservation status of priority one taxa under the Wildlife Conservation Act of its home state.