Cirsium horridulum var. horridulum |
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horrid thistle, yellow thistle |
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Habit | Plants 15–180 cm. |
Stems | densely tomentose. |
Leaves | blades oblanceolate or oblong-elliptic, 10–30 cm, shallowly to deeply pinnatifid, main spines mostly 5–10 mm, abaxial faces loosely tomentose. |
Involucres | 4–5 × 5–7 cm, ± densely tomentose. |
Corollas | yellow or crimson to red-purple. |
Phyllaries | outer and middle bodies scabridulous or minutely spinulose, marginal spinules usually 1 mm or shorter. |
Heads | 1–10. |
2n | = 32, 34. |
Cirsium horridulum var. horridulum |
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Phenology | Flowering winter–spring (Apr–Jun). |
Habitat | Fields, meadows, pinelands, roadsides, often weedy, often in damp soil |
Elevation | 0–300 m (0–1000 ft) |
Distribution |
AL; CT; DE; FL; GA; LA; MA; MD; ME; MS; NC; NH; NJ; NY; PA; RI; SC; TN; TX; VA |
Discussion | Variety horridulum occurs on the Atlantic and Gulf coastal plains fom southern Maine to Florida and west to eastern Texas and into the piedmont in much of the southeastern United States. Artificial hybrids have been produced between var. horridulum and Cirsium repandum (R. J. Moore and C. Frankton 1969), and natural hybrids with C. pumilum var. pumilum have been reported. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 115. |
Parent taxa | |
Sibling taxa | |
Synonyms | Carduus spinosissimus, Carduus horridulum var. elliottii |
Name authority | unknown |
Web links |