CPC Plant Profile: Chorro Creek Bog Thistle
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Plant Profile

Chorro Creek Bog Thistle (Cirsium fontinale var. obispoense)

Photo Credit: Lynn Robertson
Description
  • Global Rank: T2 - Imperiled
  • Legal Status: Federally Endangered
  • Family: Asteraceae
  • State: CA
  • Nature Serve ID: 130070
  • Date Inducted in National Collection: 09/22/2021

Cirsium fontinale var. obispoense is a perennial herb which can grow up to 2 m in length.  The stems are greenish purple in color, leaves are densely cobwebby, especially axially with velvety hairs.  Purple to pink flowers bloom from April through October from erect stems. [Jepson]

Participating Institutions
Updates
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, Santa Barbara Botanic Garden holds 1 accessions of Cirsium fontinale var. obispoense in orthodox seed collection. There are as many as 200 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 3 accessions of Cirsium fontinale var. obispoense in orthodox seed collection. There are as many as 1297 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, Santa Barbara Botanic Garden has collected 4 seed accessions of Cirsium fontinale var. obispoense from 4 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 30 maternal plants

  • 01/01/2010

development utility construction tar sand mining diversion of water from seeps cattle grazing competition with alien plant recreational activities possibly dredging of Morro Bay stochastic extinction, road right-of-way maintenance

  • 01/01/2010

known only from 8 locations around San Luis Obispo, total number of individuals estimated at < 3,000 around San Luis Obispo

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Photos
Nomenclature
Taxon Cirsium fontinale var. obispoense
Authority J.T. Howell
Family Asteraceae
CPC Number 954
ITIS 527371
USDA CIFOO
Common Names Chorro Creek Bog Thistle | San Luis Obispo Fountain Thistle
Associated Scientific Names Cirsium fontinale var. obispoense
Distribution Approximately 20 species are found in California's San Luis Obispo County. [CNPS]
State Rank
State State Rank
California S2
Habitat

Cirsium fontinale var. obispoense can be found in wetlands on California's Central Coast within outcrops of serpentine soil.

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID

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