Grevillea synapheae 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 family Proteaceae

Proteaceae

Proteaceae is a family of flowering plants distributed in the Southern Hemisphere. The family comprises about 80 genera with about 1600 species. Together with the Platanaceae and Nelumbonaceae they make up the order Proteales. Well known genera include Protea, Banksia, Embothrium, Grevillea,...

. It is endemic to the southwest of Western Australia

Western Australia

Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

, occurring in low heathland.

It is a prostrate to erect shrub which usually grows to between 0.2 and 1.5 metres in height and has a peak flowering period between July and October (mid-winter to mid-spring) in its native range.
The cream or white flowers are produced in axillary or terminal raceme

Raceme

A raceme is a type of inflorescence that is unbranched and indeterminate and bears pedicellate flowers — flowers having short floral stalks called pedicels — along the axis. In botany, axis means a shoot, in this case one bearing the flowers. In a raceme, the oldest flowers are borne...

s.

The species was first formally described by botanist Robert Brown

Robert Brown (botanist)

Robert Brown was a Scottish botanist and palaeobotanist who made important contributions to botany largely through his pioneering use of the microscope...

 in 1830 in Supplementum primum prodromi florae. It is closely related to Grevillea trifida, Grevillea muelleri and Grevillea prominens.

Several subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

have been identified as follows:

• G. synapheae subsp. Mt Misery (S.D.Hopper 6333), also known as "Mt Misery form"
• G. synapheae subsp. latiloba (Meisn.) Makinson, also known as the "Mogumber" or "broad-leaved" form
• G. synapheae subsp. minyulo Makinson, also known as "Minyollo form" or "Minyollo variant"
• G. synapheae R.Br. subsp. synapheae