Distribution and Habitat
Adenanthos sericeus has a disjunct distribution spanning about 500 km (300 mi) of the south coast of Western Australia. A. sericeus subsp. sericeus occurs mostly around King George Sound, extending west as far as Torbay Inlet and east almost to Cape Riche; it sometimes occurs very close to the sea. There is then a gap of over 300 km (200 mi) to the populations of A. sericeus subsp. sphalma at Cape Le Grand. Another group of A. sericeus subsp. sphalma occurs 100 km (60 mi) further east at Cape Arid.
Both subspecies are calcifuge, occurring only in siliceous sands derived from weathered granite. Thus most populations are associated with granite monadnocks. Though its range is restricted, it is locally common and often dominant. A. sericeus subsp. sphalma is often found in association with Nuytsia floribunda, Kunzea baxteri, and Xanthorrhoea species.
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