Asclepias perennis Walter

Forb/herb, perennial

Native, lower 48

Blooming: May, June

Flower color:  white

Milky sap may be irritant to some people.

Larval host to monarch, queen and soldier butterfly.  Attracts other pollinators. Unlike most other plants, Asclepias has pollinia or pollen sacs which has five slits in each flower.  The base of the pollinia attach to the insects such that the pollen sacs can be pulled free when the insect flies off.  An insect too small to exert sufficient pulling force may be trapped.  Native honey bees are trapped and die in these slits.

Three defensive qualities limit caterpillar damage:  hairs on leaves, cardenolide toxins and latex fluids.

Perennis does not disperse by wind, rather its seed pods burst and is dispersed by water.