(Heller) Chuang & Heckard
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. 
The Castilleja exserta plant is an annual about 1 foot (0.30 m) tall with a hairy stem covered in thready leaves. Like other related Castilleja 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.
Although this species is variable in appearance and easily hybridizes with other Castilleja species, 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.
- Castilleja exserta ssp. exserta — pale purple owlclover. 
- Castilleja exserta ssp. latifolia — wideleaf Indian paintbrush; endemic to coastal California. 
- Castilleja exserta ssp. venusta — endemic to California: Mojave Desert, southern San Joaquin Valley.  
Bay checkerspot butterfly host
- CalFlora database: Castilleja exserta . accessed 3.23.2013
- USDA: C. exserta . accessed 3.23.2013
- CalFlora: Castilleja exserta ssp. exserta
- CalFlora: Castilleja exserta ssp. latifolia
- CalFlora: Castilleja exserta ssp. venusta
- USDA: C. e. ssp. venusta
- Lady Bird Johnson Wildflower Center Native Plant Information Network (NPIN) — Castilleja exserta (Purple owl's clover) . accessed 3.23.2013
|Wikimedia Commons has media related to Castilleja exserta.|
- USDA Plants Profile: Castilleja exserta (exserted Indian paintbrush)
- Jepson Manual Treatment — Castilleja exserta
- Closeup photos — at Henry Coe State Park, S.F. Bay Area.
- Castilleja exserta — U.C. Photo gallery
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