Английская Википедия:Cirsium hydrophilum
Шаблон:Short description Шаблон:Speciesbox
Cirsium hydrophilum is a species of thistle which is endemic to California, where it is found only in the San Francisco Bay Area and the Sacramento-San Joaquin River Delta. This native thistle grows in wet boggy habitats.[1]
Description
Cirsium hydrophilum may reach Шаблон:Convert in height with a branching, cobwebby stem. The leaves are longest near the base of the plant, approaching Шаблон:Convert in length. They are cut into toothed lobes and covered in spines, particularly along the petiole.[1]
The inflorescence bears one or more flower heads, each up to Шаблон:Convert long. The head is lined with sticky, twisted, spiny phyllaries and contains pink to purple flowers. The fruit is an achene a Шаблон:Convert long topped with a pappus of about Шаблон:Convert centimeters.[1]
Varieties
There are two very localized varieties:
- The rare Cirsium hydrophilum var. hydrophilum, the Suisun thistle, is known from two occurrences in the Suisun Marsh, in the salt marsh habitat of the Delta in Solano County. It is treated as a federally listed endangered species.[2][3]
- The very rare Cirsium hydrophilum var. vaseyi, Mt. Tamalpais thistle or Vasey's thistle, is known from about twenty occurrences on Mount Tamalpais in Marin County, in Vacaville, California in Solano County, and inside the Presidio in the City of San Francisco. It is currently not a listed federal or state endangered species.[4][5]
References
External links
- Jepson Manual Treatment - Cirsium hydrophilum
- The Nature Conservancy-NatureServe: Cirsium hydrophilum
- ↑ 1,0 1,1 1,2 Flora of North America, Cirsium hydrophilum (Greene) Jepson, Fl. W. Calif. 507. 1901.
- ↑ California Native Plant Society: var. hydrophilum
- ↑ Calflora taxon report, University of California, Cirsium hydrophilum (E. Greene) Jepson var. hydrophilum, Suisun thistle
- ↑ California Native Plant Society: var. vaseyi
- ↑ Calflora taxon report, University of California, Cirsium hydrophilum (E. Greene) Jepson var. vaseyi (A. Gray) J. Howell, Mt. Tamalpais thistle, Vasey's thistle
- Английская Википедия
- Cirsium
- Endemic flora of California
- Natural history of the California chaparral and woodlands
- Natural history of the Central Valley (California)
- Natural history of Marin County, California
- Taxa named by Willis Linn Jepson
- Critically endangered flora of California
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- Википедия
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