Appearance
"Petrophile filifolia" is a shrub that typically grows to a height of up to 0.5 m. Its leaves are glabrous, curved, needle-shaped, 130–280 mm long and 0.9–1.5 mm wide. The flowers are arranged on the ends of branchlets in sessile, more or less spherical heads with a few narrow egg-shaped involucral bracts at the base. The flowers are about 17–25 mm long, densely hairy and cream-coloured to pale yellow. Flowering mainly occurs from October to January and the fruit is a nut, fused with others in a oval head 15–28 mm long and 14–20 mm wide.Distribution
This petrophile grows in a variety of habitats between Armadale, the Perup River, the Stirling Range and Albany in the Jarrah Forest biogeographical region of southwestern Western Australia. Subspecies "laxa" grows in woodland and heath in the Armadale-Wandering area.Status
"Petrophile filifolia" is classified as "not threatened" but subsp. "laxa" is classified as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife meaning that it is poorly known and known from only a few locations but is not under imminent threat.References:
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