Grevillea pachylostyla
Encyclopedia
Grevillea pachylostyla, commonly known as Buchan River Grevillea, is a shrub species which is endemic to the upper reaches of the Buchan River in the eastern highlands of Victoria
Victoria (Australia)
Victoria is the second most populous state in Australia. Geographically the smallest mainland state, Victoria is bordered by New South Wales, South Australia, and Tasmania on Boundary Islet to the north, west and south respectively....

, in Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

.
It has a spreading habit, growing to 1.5 metres high. The leaves are deeply lobed. Flowers appear between October and February (mid spring to late summer) in its native range. These have cream perianth
Perianth
The term perianth has two similar but separate meanings in botany:* In flowering plants, the perianth are the outer, sterile whorls of a flower...

s with contrasting black underneath and inside and cream styles that turn pink or red after antithesis
Antithesis
Antithesis is a counter-proposition and denotes a direct contrast to the original proposition...

.

The taxon
Taxon
|thumb|270px|[[African elephants]] form a widely-accepted taxon, the [[genus]] LoxodontaA taxon is a group of organisms, which a taxonomist adjudges to be a unit. Usually a taxon is given a name and a rank, although neither is a requirement...

 was first formally described in 1986 by Donald McGillivray
Donald McGillivray
Donald John McGillivray in New South Wales, Australia, and is usually known as D.J. McGillivray. He is an Australian botanical taxonomist...

 as a subspecies of Grevillea willisii
Grevillea willisii
Grevillea willisii is a shrub species which is endemic to the eastern highlands of Victoria, in Australia. Common names include Omeo Grevillea and Rock Grevillea....

, namely G. willissi subsp. pachylostyla. This description was based on a collection by James Hamlyn Willis in the Reedy River gorge on the Nuniong Plateau in Eastern Victoria in November 1964. It was promoted to species status in 1994 by Peter Olde and Neil Marriott. Plants which appear to be intermediate between this species and G. willisi have been collected near Gelantipy.

G. pachylostyla occurs on rocky granite outcrops and near streams. It is listed as "Rare in Victoria" on the Department of Sustainability and Environment's Advisory List of Rare Or Threatened Plants In Victoria.
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