Climbing Milkweed

Media
Photo of climbing milkweed flowers and leaves.
Scientific Name
Matelea decipiens
Family
Apocynaceae (dogbanes); formerly Asclepiadaceae (milkweeds)
Description

A climbing or trailing perennial vine with milky sap. Flowers brownish purple, like a 5-pointed star, with spreading corolla lobes ½–¾ inch long; the flower clusters arise on stalks from the leaf axils. Blooms May–June. Leaves opposite, broadly ovate and heart-shaped, to 6 inches long. Fruit a narrow pod, to 4 inches long, covered with slender, warty projections.

Similar species: Another climbing milkweed, M. baldwyniana, with whitish corolla lobes, is scattered in southwestern Missouri. Angle-pod (Gonolobus suberosus), found mostly in the Bootheel, resembles Mateliea species vegetatively but has yellowish flowers and angled (ridged) pods without warty projections. Sand vine and black swallowwort (Cynanchum spp.) have clear, not milky sap, and tiny flowers with upright, not spreading corolla lobes.

Size
Stem length: to nearly 10 feet.
Where To Find
image of Climbing Milkweed distribution map
Scattered to common, mostly south of the Missouri River.
Occurs in glades, savannas, tops of bluffs, rocky, open upland forests, and along streams and rivers. Less common in bottomland forests. Also found along roadsides.
The entire former milkweed family (Asclepiadaceae) has recently been rolled into the dogbane family (Apocynaceae). For many years, botanists have known the two families were closely related. The milkweed group, with its distinct floral structures, is still considered a unique subfamily or tribe of the dogbane family. As you consult various sources, you can expect to see milkweeds grouped in either family.
This native vine can be trained on a trellis or fence, where it will attract butterflies. In Illinois and Maryland, the species is listed as endangered; in Maryland, it is probably extirpated. Loss of habitat is probably the cause.
Butterflies and other insects are attracted to the flowers. A vining habit enables a plant to use another plant or structure as a support, so it can reach higher, towards the sun and pollinators, without expending resources to develop a stout stem or trunk.
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About Wildflowers, Grasses and Other Nonwoody Plants in Missouri
A very simple way of thinking about the green world is to divide the vascular plants into two groups: woody and nonwoody (or herbaceous). But this is an artificial division; many plant families include some species that are woody and some that are not. The diversity of nonwoody vascular plants is staggering! Think of all the ferns, grasses, sedges, lilies, peas, sunflowers, nightshades, milkweeds, mustards, mints, and mallows — weeds and wildflowers — and many more!