Asclepias viridis Walter

Decumbent or ascending, 2–6 dm; lvs oblong, lance-oblong, or elliptic, 6–12 cm, rounded or obtuse, abruptly narrowed at base to a 4–10 mm petiole; cor greenish, rotate (the lobes spreading or with ascending tip, not reflexed), 2–3.5 cm wide; hoods violet or purple, 4–6 mm, the horn rudimentary, represented by a small, flat, median plate near the summit of the hood. Prairies, barrens, and dry upland woods; O. to Mo. and Nebr., s. to Fla. and Tex. May–June, sometimes also in late summer. (Asclepiodora v.)