Above: Butterfly Milkweed in Thoreau Rain Garden in Madison, Wisconsin. (8/28/20).
Butterfly Milkweed - Asclepias tuberosa
The Butterfly Milkweed is a native that grows from 1 to 3 feet and blooms from July to September.
Butterfly Milkweed flowers are orange to yellow. Flowers are about 3/8-inch across, and are 5-parted crown with curved horns projecting from the center of each of the 5 cylindrical hoods. They also have 5 downward-curved petals flare out beneath.
Other Names: Butterfly-weed, Orange milkweed.
Above: Butterfly Milkweed in Thoreau Rain Garden in Madison, Wisconsin. (7/04/19).
For more information on the Butterfly Milkweed, visit Wikipedia.
Or, visit the UW-Madison Wisconsin State Herbarium website page about Butterfly Milkweed - Asclepias tuberosa.
Above: Butterfly Milkweed on the shore of Lake Wingra in Wingra Park. (6/27/20).
Above: Butterfly Milkweed seed pod in Thoreau Rain Garden. (8/16/21).
Above: 1969 Butterfly Milkweed illustration USDA FS.
Above: Butterfly-Weed (Asclepias tuberosa) illustration by Alice Lounsberry circa 1899.
Above: Butterfly-Weed (Asclepias tuberosa) illustration circa 1899.
Above: 1913 Butterfly-Weed illustration.
Above: Butterfly Milkweed specimen collected July 15, 1974 in Grant County near Platteville on a bluff.