Grevillea williamsonii

Distribution Map
Family: Proteaceae
Distribution: Very restricted area in the Grampian Ranges, western Victoria.
Common Name: No generally accepted common name
Derivation of Name: Grevillea...after Charles Francis Greville, co-founder of the Royal Horticultural Society
williamsonii...after the original discoverer, H.B. Williamson.
Conservation Status: Not currently listed as threatened under the EPBC Act*. However, the species is likely to be included under that Act as it occurs in small, restricted populations and is at risk in the short term. Probable 2EC-t classification under the ROTAP * system.

General Description:

Grevillea williamsonii was originally discovered in 1893 on Mt. Abrupt at the southern extremity of the Grampians/Gariwerd Ranges in Western Victoria. This area was burnt out by a bushfire four years later and, despite a number of searches, no further plants were found. It was assumed that the plant was probably a hybrid of G.aquifolium or a hybrid of that species. However, in 1992, plants identical to the original collection were discovered in the same general area as the original collection. Presently less than 10 mature plants are known in the wild.

Grevillea williamsonii
Grevillea williamsonii
Photo: Neil Marriott

The species is closely related to G.illicifolia and is a dense shrub, 1 m x 1 m, with a distinct horizontal layering habit. It has ashy, grey-green foliage and masses of small, yellow toothbrush flowers which age to pink.

Because of its rarity, the plant is not in general cultivation although is being grown at several Botanic Gardens. If these cultivated specimens are successful, the species may eventually find its way into the general horticultural community. G.williamsonii is likely to be readily cultivated in temperate areas but may prove difficult to grow in tropical and sub tropical climates.

* EPBC Act = Environment Protection and Biodiversity Conservation Act 1999;
  ROTAP = Rare or Threatened Australian Plants (Briggs and Leigh, 1988)
  For further information refer the Australian Plants at Risk page

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