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The looks are somewhat similar to butterfly weed, a native milkweed found over most of the eastern United States, including Florida, but the flowers of butterfly weed are scarlet, while tropical milkweed's are multi-hued — various shades of red, yellow and orange. Butterfly weed also has a deep taproot; tropical milkweed doesn't. Because of that tropical milkweed is often potted and taken indoors during winter. That allows fully flowering plants to be placed outdoors in the spring. The fruit is a pod filled with whispy seeds that drift with the wind.
Tropical milkweed doesn't readily naturalize in most of the United States. According to the United States Department of Agriculture, Florida, Louisiana, Texas, Tennessee, California and Hawaii are the exceptions. Again, according to the USDA, it's mostly found in Florida's Peninsula, mostly along the Atlantic Coast, from Volusia County south into the Keys and also in a few Panhandle counties. Favored habits include coastal areas, disturbed areas and rockland hammocks. Some groups list it as invasive in Hawaii, California, Texas, Louisiana and Tennessee but to the best of our knowledge it's not listed officially by state authorities. Tropical milkweed is found throughout parts of Asia, including China, Cambodia, Japan, Malaysia and Thailand, Africa, including South Africa and Mozambique, Australia and the Pacific islands, where it is considered an invasive.
Other common names for Tropical milkweed include Mexican milkweed, scarlet milkweed, blood flower, swallow-wort and silkweed. It is a member of Apocynaceae, the family of periwinkles and oleander. The USDA puts it in Asclepiadaceae, the milkweed family. |
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