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Seeds of Asclepias syriaca (Common Milkweed) Milkweed latex contains about two percent latex, and during World War II both Nazi Germany and the US attempted to use it as a source of natural rubber, although no record of large-scale success has been found. [41]
Asclepias syriaca, commonly called common milkweed, butterfly flower, silkweed, silky swallow-wort, and Virginia silkweed, is a species of flowering plant. [ 2 ] [ 3 ] It is native to southern Canada and much of the United States east of the Rocky Mountains, excluding the drier parts of the prairies. [ 4 ]
Its green fruits contain a toxic milky sap that is extremely bitter and turns into a latex-like substance, which is resistant to soap. Common names for the plant include Apple of Sodom, [2] Sodom apple, roostertree, [3] king's crown, [4] small crownflower, [3] giant milkweed, [5] rubber bush, [2] and rubber tree. [2]
This milkweed is native to the desert southwest of the United States and northern Mexico. It grows in dry slopes, mesas, plains and desert washes. [2] Researchers in Bard, California, tested the plant as a potential source of natural rubber in 1935. [3] Asclepias subulata is a larval host for the monarch butterfly. [4]
Calotropis is a genus of flowering plants in the family Apocynaceae, first described as a genus in 1810.It is native to southern Asia and North Africa. [2]They are commonly known as milkweeds because of the latex they produce.
The major commercial source of natural rubber latex is the Amazonian rubber tree (Hevea brasiliensis), [1] a member of the spurge family, Euphorbiaceae. Once native to Brazil, the species is now pan-tropical. This species is preferred because it grows well under cultivation.
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You can easily spot the flower clusters (technically, umbellate cymes) in open meadows. Milkweed plants are a major food source for Monarch and Queen butterfly caterpillars and as with other milkweed plants, it bleeds white latex if a stem is cut and this sap is toxic to some animals and to humans.