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Asclepias tuberosa
http://www.hawriverprogram.org/NCPlants/Asclepias_tuberosa_page.html
Image of entire plant with closeups of leaves and flowers. Describes blooming period and habitat.
Asclepias tuberosa (Butterfly Milkweed)
http://www.2bnthewild.com/plants/H166.htm
Description and image.
Asclepias tuberosa (Butterfly Milkweed)
http://www.lib.ksu.edu/wildflower/butterfly.html
Provides information on physical features, flowering period, and habitat. With photos.
Asclepias tuberosa (Butterfly Weed)
http://www.ct-botanical-society.org/galleries/asclepiastube.html
Photos and brief facts on this plant.
Asclepias tuberosa interior (Butterfly Milkweed)
http://www.illinoiswildflowers.info/prairie/plantx/btf_milkweedx.htm
Describes physical features, range, habitat, and faunal associations. Provides a photo.