Cirsium hydrophilum
| Cirsium hydrophilum | |
|---|---|
| |
| Suisun thistle | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Cirsium |
| Species: | C. hydrophilum
|
| Binomial name | |
| Cirsium hydrophilum | |
| Synonyms[1] | |
| |
Cirsium hydrophilum is a species of
Description
Cirsium hydrophilum may reach 2 metres (6.6 ft) in height with a branching, cobwebby stem. The leaves are longest near the base of the plant, approaching 90 centimetres (35 in) in length. They are cut into toothed lobes and covered in spines, particularly along the petiole.[2]
The
pappus of about 1.5 centimetres (0.59 in) centimeters.[2]
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.[3][4]
- The very rare Cirsium hydrophilum var. vaseyi, Mt. Tamalpais thistle or Vasey's thistle, is known from about twenty occurrences on
References
- ^ The Plant List, Cirsium hydrophilum (Greene) Jeps.
- ^ a b c 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
External links
- Jepson Manual Treatment - Cirsium hydrophilum
- The Nature Conservancy-NatureServe: Cirsium hydrophilum
Wikimedia Commons has media related to Cirsium hydrophilum.
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