Flora of North America species comparison

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Cirsium fontinale var. campylon
Photo is of parent taxon

Mount Hamilton thistle, Mt. Hamilton thistle
Basal leaves

longer spines 4–15 mm, distal faces equally glandular and tomentose.
Cauline leaves

longer spines 10–18 mm.
Phyllaries

65–85, 25–35 of them reflexed;

apical spines 3–6 mm;

marginal spines usually absent.
Cypselae

3.4–4.1 mm.
Distalmost

stem bracts typically separated from heads.
2n

= 34.

Cirsium fontinale var. campylon
Phenology Flowering spring–summer (Apr–Aug).
Habitat Serpentine seeps in areas of chaparral, valley grasslands, foothill woodlands
Elevation 300–800 m (1000–2600 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Variety campylon is endemic to the Mt. Hamilton Range in Alameda, Santa Clara, and Stanislaus counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 162.
Parent taxa Asteraceae > tribe Cardueae > Cirsium > Cirsium fontinale
Sibling taxa
C. fontinale var. fontinale, C. fontinale var. obispoense
Synonyms C. campylon
Name authority (H. Sharsmith) Pilz ex D. J. Keil & C. E. Turner: Phytologia 73: 313. (1992)
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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