Calothamnus quadrifidus subsp. teretifolius
"Calothamnus quadrifidus" subsp. "teretifolius" is an erect shrub which sometimes grows to a height of . Its leaves are linear, circular in cross section, lack hairs, are long and wide. The flowers are red and are arranged in clusters, usually on one side of the stem amongst the older leaves. The stamens are arranged in 4 claw-like bundles, each about long. Flowering occurs from September to December and is followed by fruits which are woody capsules, long. "Calothamnus quadrifidus" subsp. "teretifolius" was first formally described in 2010 by Alex George in Nuytsia from a specimen collected west of the Whicher Scarp. The epithet "teretifolius" is "from the Latin "teres" (terete) and "folium" (a leaf). "Calothamnus quadrifidus" subsp. "teretifolius" is found inland from Busselton in the Jarrah Forest and Swan Coastal Plain biogeographic regions. It grows in clay in winter-west areas in shrubland. "Calothamnus quadrifidus" subsp. "teretifolius" is classified as "Priority Four" by the Western Australian Government Department of Parks and Wildlife meaning that it is rare or near threatened.
Description
Calothamnus quadrifidus" subsp. (Subspecies "quadrifidus" also has cylindrical leaves but they often have a covering of long, silky hairs.)