Apocynum cannabinum L.
Erect, patch-forming perennial.
Opposite, narrow oval to egg-shaped, 2 to 5 inches long with smooth margins. The upper leaf surface is usually pale to bluish-green and smooth; the lower leaf surface may be sparsely hairy. Leaves are smaller than those of common milkweed and exude a milky sap when damaged.
Erect, up to 6-foot-tall, slender, hairless, reddish stems are herbaceous and multi-branched at the top and semi-woody at the base. Stems exude a milky sap when damaged.
Flowers and fruit
Small, white to greenish white, bell-shaped flowers are found in flat- to round-topped clusters. Fruit are 4- to 8-inch-long, narrow, reddish brown, sickle-shaped capsules that usually occur in pairs. Pods split open at maturity to release small, spindle-shaped seeds, each with a tuft of long, silky hairs that aid in wind dissemination.
Seeds, creeping roots and rhizomes.
Spreading dogbane (A. androsaemifolium L.) Differs by having a preference for a drier habitat, usually shorter height, often drooping leaves and more distinct, usually pinkish white flowers.
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