CPC Plant Profile: Mt. Gleason Indian-paintbrush
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Plant Profile

Mt. Gleason Indian-paintbrush (Castilleja gleasonii)

This shot shows the entire Mount Gleason indian paintbrush plant, with its characteristic scarlet flowers. Photo Credit: Valerie Soza
Description
  • Global Rank: G2 - Imperiled
  • Legal Status: N/A
  • Family: Orobanchaceae
  • State: CA
  • Nature Serve ID: 139954
  • Date Inducted in National Collection: 03/08/1989

This perennial hemiparasite (root parasite) is an endemic to the San Gabriel Mountains, with a limited range in the western part of the mountain range in the Mount Gleason area. Its scarlet inflorescence is showy like many other related paintbrushes, blooming from April to July, however this taxon is distinguished by the presence of branched hairs throughout (Mistretta and Brown 1987).

Participating Institutions
Updates
  • 10/09/2020
  • Demographic Research

The Angeles National Forest has adopted a species management guide for this taxon and a monitoring program to examine population dynamics was initiated in 1982 (Mistretta 1994b).

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 5 accessions of Castilleja gleasoni in orthodox seed collection. There are as many as 27842 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 5 seed accessions of Castilleja gleasoni from 4 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 25 maternal plants

Valerie Soza
  • 01/01/2010

Populations are threatened by recreational activities on the Forest, in close proximity to campgrounds and trails, fuelwood harvesting, and off-highway vehicle activity. In addition, evidence of browsing, most likely by deer, has been observed (Mistretta

Valerie Soza
  • 01/01/2010

Known from 6 general locations: Chilao/Horse Flats, Lightning Ridge, Little Rock Creek, Messenger Flats, Mount Gleason, and North Fork Pacoima Canyon. A total of at least 3700 individuals was observed in 1987 during surveys of all known populations except the North Fork Pacoima Canyon site (Mistretta 1994a, Mistretta and Brown 1987).

Valerie Soza
  • 01/01/2010

None known.

Valerie Soza
  • 01/01/2010

The Angeles National Forest has adopted a species management guide for this taxon and a monitoring program to examine population dynamics was initiated in 1982 (Mistretta 1994b).

Valerie Soza
  • 01/01/2010

Little is known on the biological information of this species, including life history, pollination biology, reproduction, etc. (Mistretta and Brown 1987). This species has been placed under Castilleja pruinosa in the current treatment in the Jepson Manual of California plants. Excluding Castilleja gleasonii locations, Castilleja pruinosa is known only from northern California and southern Oregon. Under the species description for Castilleja pruinosa, plants with wider calyx lobes from the San Gabriel Mountains are identified as having been called Castilleja gleasonii, which is probably a polyploid derivative/hybrid of C. affinis ssp. affinis and C. foliolosa. This group is recognized as a highly variable and confusing complex needing further study (Hickman 1993).

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Photos
Nomenclature
Taxon Castilleja gleasonii
Authority Elmer
Family Orobanchaceae
CPC Number 816
ITIS 834195
USDA CAGL17
Common Names Mt. Gleason Indian paintbrush | Mt. Gleason paintbrush
Associated Scientific Names Castilleja gleasonii | Castilleja pruinosa
Distribution North Fork Pacoima Canyon east and south to Chilao Flat, San Gabriel Mountains, Transverse Ranges, Los Angeles County, California.
State Rank
State State Rank
California S2
Habitat

Rocky, granitic places, 5000-7000 feet elevation, in yellow pine forest, lower montane coniferous forest, and pinyon and juniper woodland. Areas of gentle to moderate relief, in sandy or loamy, well-drained soils with some litter accumulation.

Ecological Relationships

Likely hosts of Castilleja gleasonii include Artemisia tridentata (sagebrush), Eriogonum species (buckwheat), Galium angustifolium (narrow-leaved bedstraw), and Leptodacctylon californicum (prickly phlox) (Mistretta and Brown 1987).

Pollinators
Common Name Name in Text Association Type Source InteractionID

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