Asclepias tuberosa (Butterfly Milkweed)
- Provides information on physical features, flowering period, and habitat. With photos.
- http://www.lib.ksu.edu/wildflower/butterfly.html

Asclepias tuberosa interior (Butterfly Milkweed)
- Describes physical features, range, habitat, and faunal associations. Provides a photo.
- http://www.illinoiswildflowers.info/prairie/plantx/btf_milkweedx.htm

Asclepias tuberosa (Butterfly Weed)
- Photos and brief facts on this plant.
- http://www.ct-botanical-society.org/galleries/asclepiastube.html