Castilleja_exserta

<i>Castilleja exserta</i>

Castilleja exserta

Species of flowering plant

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.[2]

Quick Facts Castilleja exserta, Conservation status ...

This species is native to the Southwestern United States in various habitats of California, Arizona, and New Mexico; and to Northwestern Mexico.[3] 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.[4]

Varieties

Varieties include:

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.[12]

  • 2015
  • Antelope Valley Purple owl's clover

References

  1. [1]
    "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 16 April 2023.
  2. [2]
    CalFlora database: Castilleja exserta . accessed 3.23.2013
  3. [3]
    Sullivan, Steven. K. (2018). "Castilleja exserta". Wildflower Search. Retrieved 2018-07-06.
  4. [4]
    "Castilleja exserta". in Jepson Flora Project (eds.) Jepson eFlora. Jepson Herbarium; University of California, Berkeley. 2018. Retrieved 2018-07-06.
  5. [5]
    CalFlora: Castilleja exserta ssp. exserta
  6. [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. [7]
    CalFlora: Castilleja exserta ssp. latifolia
  8. [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. [9]
    CalFlora: Castilleja exserta ssp. venusta
  10. [10]
    USDA: C. e. ssp. venusta
  11. [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. [12]
    Lady Bird Johnson Wildflower Center Native Plant Information Network (NPIN) — Castilleja exserta (Purple owl's clover) . accessed 3.23.2013
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