Flora of North America species comparison

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Cirsium hydrophilum var. vaseyi
Photo is of parent taxon

Mount Tamalpais or Vasey's thistle, Mount Tamalpais thistle, Mt. Tamalpais thistle, Vasey's thistle
Heads

usually 3–3.5 cm.
Cypselae

oblong or elliptic, 4–5 mm.
2n

= 32.

Cirsium hydrophilum var. vaseyi
Phenology Flowering spring–summer (May–Jul).
Habitat Spring-fed marshy meadows on serpentine parent material in areas of chaparral and mixed evergreen forest
Elevation 300–500 m (1000–1600 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Variety vaseyi is endemic to the slopes of Mt. Tamalpais in the southern North Coast Range of Marin County, California.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 133.
Parent taxa Asteraceae > tribe Cardueae > Cirsium > Cirsium hydrophilum
Sibling taxa
C. hydrophilum var. hydrophilum
Synonyms Cnicus breweri var. vaseyi, C. montigenum, C. vaseyi
Name authority (A. Gray) J. T. Howell: Leafl. W. Bot. 9: 11. (1959)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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