Flora of North America species comparison

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Cirsium horridulum var. vittatum
Photo is of parent taxon

Florida thistle, yellow thistle
Habit Plants 30–90 cm.
Stems

glabrous to sparsely tomentose.
Leaves

blades linear to oblong, 10–30 cm, spinose-dentate to shallowly pinnatifid, main spines mostly 5–10 mm, abaxial faces glabrous or nearly so.
Involucres

3–4 × 3–6 cm, glabrous.
Corollas

purple.
Phyllaries

outer and middle bodies densely scabridulous, marginal spinules 0.1–0.5 mm.
Heads

1–10.
2n

= 32, 33, 34, 35.

Cirsium horridulum var. vittatum
Phenology Flowering winter–summer (Feb–Aug).
Habitat Meadows, pastures, old fields, pinelands, usually in damp soil
Elevation 0–100 m (0–300 ft)
Distribution
from FNA
AL; FL; GA; LA; MS; NC; SC
[BONAP county map]
Discussion

Variety vittatum grows on the coastal plain.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 116.
Parent taxa Asteraceae > tribe Cardueae > Cirsium > Cirsium horridulum
Sibling taxa
C. horridulum var. horridulum, C. horridulum var. megacanthum
Synonyms Carduus vittatus, Carduus smallii, C. smallii, C. vittatum
Name authority (Small) R. W. Long: Rhodora 72: 45. (1970)
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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