Drosera rosulata is a rosetted tuberous species endemic to Western Australia. The species is somewhat morphologicaly variable, especially in size, but is identified by the depressed central vein of its leaves. These leaves appear if they have been creased along its length and are obovate in shape. The flowers are white and borne singly on the peduncle, emerging at the start of the growing season.
The species grows along the western coastal plain, the Darling Scarp and the foothills east of the scarp. It is associated with swamp flats, watersheds and the drainage fields of granite outcrops, where it grows in sandy loam.
Drosera rosulata often grows alongside other rosetted species throughout its range. In the Darling Scarp, it often grows alongside Drosera bulbosa, but seems to have a slight preference for loam (over the moss that D. bulbosa inhabits). It is primarily distinguished by its depressed central vein. Drosera orbiculata also shares this feature but has orbicular leaves.