Another thank you is in order to J.G. in S.F.@Flickr for sending along these photographs from the San Francisco Botanical Garden (via the UBC BG Botany Photo of the Day Flickr Pool | original 1 | original 2).
Petrophile, as you might guess, translates into “rock-loving”. This is indeed the case for this relatively short shrubby plants, as they are found in coastal sandy areas, rocky outcrops and inland gravelly areas (though never too far from the coast, perhaps 150km). Common name for plants in the genus used by people in eastern Australia include conesticks, coneflower and conebush. However, in western Australia (the centre of diversity for the genus), these common names aren’t used and it seems they are simply referred to as petrophile.
Petrophile biloba, or granite petrophile, is native to a small area of southwestern Western Australia, near Perth. As noted by FloraBase, this species of hillsides and granite outcrops grows to 2m high. The Australian Native Plant Society provides cultivation and propagation information on it: Petrophile biloba.