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Castilleja exserta (formerly Orthocarpus purpurascens) is a species of plant in the genus which includes the Indian paintbrushes. Its common names include purple owl's clover, escobita, and exserted Indian paintbrush. This species is native to the southwestern United States but may be found in places where it has been introduced, such as Hawaii. The plant is an annual about a foot tall with a hairy stem covered in thready leaves. Although this species is variable in appearance and easily hybridizes with other Castilleja, it generally bears a brightly-colored inflorescence of shaggy pink-purple or lavender flowers. The thin, erect bracts are usually tipped with the same color, giving the inflorescence the appearance of a paintbrush. It produces pods containing seeds. Like other related plants this is a hemiparasite which derives some of its nutrients directly from the roots of other plants by injecting them with haustoria; this is the reason for its small, reduced leaves. The flowers attract bees. This is a crucial host plant for the bay checkerspot butterfly, a threatened species in California.
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