Prenanthes aspera Michx.

• Authority

  Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

• Family

  Asteraceae

• Scientific Name

  Prenanthes aspera Michx.

• Description

  Species Description - Stem strict, 5–17 dm, rough-hairy or scabrous at least above; lvs scabrous or coarsely hirsute on the lower and often also the upper side, toothed or entire, the lower ones well developed and somewhat obovate, tapering to the petiole, but soon deciduous, the others sessile or nearly so and often clasping, oblong to elliptic or lanceolate, gradually reduced upward, the larger ones 4–11 × 1–5 cm; infl narrow and elongate, thyrsoid-racemiform, the heads crowded, loosely ascending to suberect; invol 12–17 mm, coarsely and usually densely long-hairy, rather pale, with (6–)8(–10) principal bracts, fls (8–)11–14(–19), ochroleucous; pappus stramineous. Dry prairies; O. to Minn., S.D., Okla., and La. Aug., Sept.

• Common Names

  rough white lettuce