Flora of North America species comparison

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Cirsium fontinale var. obispoense
Photo is of parent taxon

Chorro Creek bog thistle
Basal leaves

longer spines 5–9 mm;

distal faces more densely glandular than tomentose.
Cauline leaves

longer spines 4–7 mm.
Phyllaries

70–120, 28–38 of them reflexed;

apical spines 2–3 mm;

marginal spines usually absent.
Cypselae

3.8–4 mm.
Distalmost

stem bracts tightly subtending heads or separated from them.
2n

= 34.

Cirsium fontinale var. obispoense
Phenology Flowering winter–summer (Jan–Sep).
Habitat Serpentine seeps, coastal live oak woodlands, grasslands, riparian areas
Elevation 40–300 m (100–1000 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Variety obispoense is known only from the southern Santa Lucia and San Luis ranges of San Luis Obispo County.

(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. campylon, C. fontinale var. fontinale
Name authority J. T. Howell: Leafl. W. Bot. 2: 71. (1938)
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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