Omalotheca is a genus of flowering plants in the family Asteraceae.Cassini, Alexandre Henri Gabriel de. 1828. Dictionnaire des Sciences Naturelles [Second edition] 56: 218–219in FrenchTropicos, Omalotheca Cass. It is commonly known as arctic cudweed.USDA Natural Resources Conservation Service (NRCS) PLANTS Database: Omalotheca Cass. 12/26/2012 05:16 PM CSTFlora of North America Omalotheca Cassini in F. Cuvier
There is some disagreement about which species should be included in Omalotheca. Some or all of the species are sometimes included in Gnaphalium.Flann, C (ed) 2009+ Global Compositae Checklist
Species , Plants of the World Online accepted the following species: Omalotheca caucasica (Sommier & Levier) Czerep. Omalotheca diminuta (Braun-Blanq.) Bartolucci & Galasso Omalotheca hoppeana (W.D.J.Koch) F.W.Schultz & Sch.Bip. Omalotheca leucopilina (Schott & Kotschy ex Boiss.) Holub Omalotheca nanchuanensis (Y.Ling & Y.Q.Tseng) Holub Omalotheca norvegica (Gunnerus) F.W.Schultz & Sch.Bip. Omalotheca roeseri (Boiss. & Heldr.) Holub Omalotheca supina (L.) DC. Omalotheca sylvatica (L.) F.W.Schultz & Sch.Bip. Omalotheca × traunsteineri (Murr) Dostál
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