20, see text Crocanthemum is a genus of flowering plants in the family Cistaceae.

[2] The common name frostweed relates to the ice crystals which form from sap exuding from cracks near the base of the stem in the late fall.

With the exception of species in California, they generally produce two types of flowers: showy, yellow chasmogamous (cross-pollinated) produced earlier in the growing season, followed by cleistogamous (self-pollinated) flowers that are smaller and lack petals.

[2][4] All species of Crocanthemum are fire tolerant and are found in open habitats.

[2][5] This required the resurrection of the genus Crocanthemum in order to maintain monophyly.