SWAMP MILKWEED, Asclepias incarnata L. 1, upper part of plant in flower; 2, seed pods; 3, single flower; 4, hood (5 of which make up the corona). Perennial, reproducing by seeds and weakly creeping rootstocks. Stems single or clustered, 1 to 4 feet (0.3 to 1.2 m) tall, very leafy, branched toward top, with milky juice. Leaves opposite, long, narrow, oblong but tapering toward tip, smooth or hairy, 4 to 7 inches (10 to 17.5 cm) long. Flowers pink to rose-purple or whitish, clustered into several ball-like groups (umbels). Seed pod erect on short stems, about 3 inches (7.5 cm) long, smooth or slightly hairy. Seeds oval, about 3/8 inch (9 mm) long, with tuft of hairs at tip. Found in swamps, ditches, and wet prairies, seldom in cultivated fields. Poisonous to livestock.