There are three milkweeds which are widely different vet contain as characteristics the basic requirements of a milkweed - milky juice, opposite leaves, intricate flowers designed in such a manner that insects often are trapped during the process of pollination.
Asclepias phytolaccoides Pursh.
Asclepias ample.xicaulis Sm.
Summer. Prairie roadsides, sands, woods.
Green milkweed (Acerates viridiflora) is a plant of the prairies and dry soil. Although it is not as colorful as some of the other milkweeds, its delicate green flowers nevertheless are decidedly ornamental. They lack the horn structure of other milkweeds. The flowers are tightly held, green and white blossoms arranged in a whorled cluster in the axils of long, narrow, veiny leaves.
Blunt-leaved milkweed (Asclepias amplexicaulis) is a plant of the -and country, a plant of utmost economy of leaf, flower, and fruit. The short, pale stem seldom has more than three pairs of stemless, pale green, pink-veined leaves. The lowest pair usually is much smaller, and all six are fluted, thick, and large. Above them stand- the -till' stem topped with typical milkweed flowers held apart from each other in a sparse cluster. The flowers are pale pinkish-white with green sepals. Usually only one or two large seed pods result from the head of flowers.
Poke milkweed (Asclepias phytolaccoides) is a lanky, thin-leaved plant of the deep woods. In midsummer its green and white and pale pink flowers are in bloom among the plant- on a half sunny, half shady, dry hillside in the oak woods.