Cirsium pumilum (Nutt.) Spreng.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Asteraceae
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Scientific Name
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Description
Species Description - Stout biennial (sometimes short-lived perennial?) 3–8 dm, with 1–several coarse, slightly thickened roots; herbage green and coarsely arachnoid-villous or crisp-hirsute; lvs lobed or pinnatifid, beset with numerous short marginal spines in addition to the scattered longer ones; basal lvs well developed and generally persistent, these and the lower cauline ones 12–25 × 2–7 cm; cauline lvs not especially crowded except sometimes near the base; heads few or solitary, large, the invol 3.5–5 cm, usually some of its bracts with a narrow, glutinous dorsal ridge; middle and outer invol bracts tipped by a short, ± erect spine; inner bracts elongate, with expanded, chartaceous, crisped and erose tip; fls sweet-scented, purple (white); achenes 3–4 mm; 2n=30. Pastures, old fields, and open woods; s. Me. to w. N.Y., s. to Del., Pa., and in the mts. to Va., e. W.Va., and N.C. (C. odoratum)
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Common Names
pasture-thistle