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Herbs, annual, with taproot. Stems erect, unbranched or branched, 30–85(–150) cm, pilose or glabrous. Leaves alternate; stipules 0.1–0.3 mm; petiole 0.2–3 mm, glabrous or minutely pilose; blade broadly ovate to elliptic, 32–62(–82) × 18–28(–52) mm, base rounded to cuneate, margins entire, often white on distal leaves, apex acute, rarely mucronate, surfaces glabrous; venation obscure, only midvein conspicuous. Cyathia in terminal pleiochasia, dichasial bracts narrowly elliptic to oblanceolate with conspicuous white margins; peduncle 1.8–2.7(–22) mm, densely pilose. Involucre campanulate, 2.2–3.5 × 1.3–2.3 mm, margin between glands deeply divided into fringe of fimbriate lobes, pilose; glands 4–5, green to greenish yellow, reniform to subcircular, 0.7–1.1 × 1–1.6 mm; appendages white, orbiculate, 1.5–2.7 × 1.9–2.9(–3.6) mm, entire. Staminate flowers 30–70. Pistillate flowers: ovary pilose; styles 1–2.5 mm, 2-fid 1/2–2/3 length. Capsules oblate, 3–5 × 3.5–7.5 mm, moderately to densely pilose; columella 3–4.1 mm. Seeds orange-tan to gray, ovoid, 3.7–3.9 × 3–3.3 mm, rugose, with 2 transverse ridges (one dark orange to brown, other inconspicuous); caruncle absent. 2n = 56.
Annual; stems erect, 3–8 dm, softly villous, especially above; cauline lvs alternate, sessile, broadly ovate to elliptic or obovate-oblong, 4–10 cm; lvs subtending the 3-rayed infl whorled or sometimes merely opposite, those within infl smaller, margined with white or wholly white; cymes crowded; involucres hairy, the 5 lobes deeply fimbriate, the 5 appendages white, conspicuous, reniform to broadly ovate; fr 3-lobed, 6–7 mm thick; seeds ovoid, 4 mm, tuberculate; 2n=56. Prairies and plains; Minn. to Mo., w. to Mont. and N.M., and escaped from cult. elsewhere. Summer. (Dichrophyllum m.; Lepadena m.)
A herb. It grows each year from seeds. It grows 60-90 cm tall. Many stems come from the base. The leaves are alternate and without leaf stalks. The leaves are 5-7 cm long by 3 cm wide.
