The floral cup is shaped like half a sphere, about 1.5 mm (0.06 in) long, smooth but hairy near its base.

[2] Verticordia densiflora was first formally described by John Lindley in 1839 and the description was published in A Sketch of the Vegetation of the Swan River Colony.

[1] This variety of V. densiflora usually grows in sand, sometimes with gravel or loam, often with other species of Verticordia in heath and shrubland.

It occurs between Kalbarri and Eneabba near the coast and as far inland as Morawa[2] in the Avon Wheatbelt and Geraldton Sandplains biogeographic regions.

rosteostella is classified as "Priority Three" by the Western Australian Government Department of Parks and Wildlife[4] meaning that it is poorly known and known from only a few locations but is not under imminent threat.