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Castilleja exserta

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Species of flowering plant

Castilleja exserta
Conservation status

Apparently Secure  (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Orobanchaceae
Genus: Castilleja
Species: C. exserta
Binomial name
Castilleja exserta
(Heller) Chuang & Heckard

Castilleja exserta (formerly Orthocarpus purpurascens) is a species of plant in the genus Castilleja 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 in various habitats of California, Arizona, and New Mexico; and to Northwestern Mexico. It is an introduced species in Hawaii.

Description

Foliage and stem, before flowering.

Castilleja exserta is an annual herb about 100–450 millimetres (4–18 in) tall with a hairy stem covered in thready leaves. Like other related Castilleja plants, this species is a hemiparasite, deriving some of its nutrients directly from the roots of other plants by infiltrating them with haustoria. As a result, its own leaves are small and reduced.

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.

Varieties

Varieties include:

  • Castilleja exserta var. exserta — pale purple owlclover.
  • Castilleja exserta var. latifolia — wideleaf Indian paintbrush; endemic to coastal California.
  • Castilleja exserta var. venusta — endemic to California: Mojave Desert, southern San Joaquin Valley.

Bay checkerspot butterfly host

This is a crucial host plant for the Bay checkerspot butterfly (Euphydryas editha bayensis), which is a threatened species that is endemic to the San Francisco Bay region in California.

The seeds were harvested by indigenous peoples of California for food.

  • 2015 2015
  • Antelope Valley Purple owl's clover Antelope Valley Purple owl's clover

References

  1. "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 16 April 2023.
  2. CalFlora database: Castilleja exserta . accessed 3.23.2013
  3. Sullivan, Steven. K. (2018). "Castilleja exserta". Wildflower Search. Retrieved 2018-07-06.
  4. "Castilleja exserta". in Jepson Flora Project (eds.) Jepson eFlora. Jepson Herbarium; University of California, Berkeley. 2018. Retrieved 2018-07-06.
  5. CalFlora: Castilleja exserta ssp. exserta
  6. ^ "Castilleja exserta (A.Heller) T.I.Chuang & Heckard | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2021-07-19.
  7. CalFlora: Castilleja exserta ssp. latifolia
  8. "Castilleja exserta var. latifolia (S.Watson) J.M.Egger | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2021-07-19.
  9. CalFlora: Castilleja exserta ssp. venusta
  10. USDA: C. e. ssp. venusta
  11. "Castilleja exserta var. venusta (A.Heller) J.M.Egger | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2021-07-19.
  12. Lady Bird Johnson Wildflower Center Native Plant Information Network (NPIN) — Castilleja exserta (Purple owl's clover) . accessed 3.23.2013

External links

Taxon identifiers
Castilleja exserta
Orthocarpus exsertus
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