1. Thaspium barbinode (Michx.) Nutt.

Pl. 213 f–h; Map 887

Stems 40–110 cm long, usually pubescent with a band of short, white hairs (visible to the naked eye) at the base of at least the uppermost leaf sheaths, sometimes also sparsely and minutely hairy toward the tip. Basal leaves with the blades 6–25 cm long, ternately or ternately then pinnately 2 or 3 times compound, the leaflets 1–12 cm long, lanceolate to ovate, tapered to rounded (often unequally) at the base, sometimes with 1 or 2 lobes toward the base, the margins otherwise finely to coarsely toothed, short-hairy, not whitened, the surfaces glabrous or more commonly sparsely to moderately pubescent with straight, white, speading hairs. Stem leaves similar to the basal leaves, gradually reduced in size and degree of dissection toward the stem tip. Rays 8–16, 1–4 cm long, more or less equal in length. Involucel of linear bractlets. Flower stalks 2–5 mm long. Petals pale yellow or cream-colored. Fruits 3–6 mm long. 2n=22. April–June.

Scattered throughout most of the state but absent from the western portion of the Glaciated Plains Division and the Mississippi Lowlands (eastern U.S. west to Minnesota and Texas; Canada). Bottomland forests, mesic upland forests, banks of streams, rivers, and spring branches, fens, bases and ledges of bluffs, and margins of glades; also roadsides and railroads.

For a discussion of possible hybridization with T. trifoliatum, see the treatment of that species.