Orthocarpus, or owl's-clover, is a genus of flowering plants in the family Orobanchaceae (broomrapes). They are native to North America. A number of species formerly included in Orthocarpus have been transferred to the genus Castilleja, which includes the plants commonly known as Indian paintbrush. Plants of the genus are generally less than in height.
Like their close relatives in genus Castilleja, Orthocarpus are root hemiparasites, capable of photosynthesis but extracting water and mineral nutrients through attachment to the roots of host plants.
Some animal species such as the Edith's checkerspot butterfly use these plants as hosts during ovipositing.
Species , Plants of the World Online accepted the following species: Orthocarpus barbatus J.S.Cotton Orthocarpus bracteosus Benth. Orthocarpus cuspidatus Greene Orthocarpus holmgreniorum (T.I. Chuang & Heckard) L. M. Shultz & F. J. Smith Orthocarpus imbricatus Torr. ex S.Watson Orthocarpus luteus Nutt. Orthocarpus pachystachyus A.Gray Orthocarpus purpureoalbus A.Gray ex S.Watson Orthocarpus tenuifolius (Pursh) Benth. Orthocarpus tolmiei Hook. & Arn.
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