Asclepias perennis

An Asclepias of moist ground that I have seen only in eastern Texas, though it does occur in southwestern Indiana.

Plant habit on the Kirby Nature Trail, Big Thicket National Preserve, Texas, 3 Jul 2007.

Inflorescences & leaves on the Kirby Nature Trail, Texas, 3 Jul 2007.

Flowers on the Kirby Nature Trail, 3 Jul 2007.