According to Kew Gardens, it is from Central America and probably Cuba and Florida.   After going through the photos and labels for specimens in the S , Tolerance, Unknown Some tolerance to salty wind but not direct salt spray. , Considertions, Noted for being weedy. , Habitat, Disturbed. Old orange groves, pasture, roadsides. May occur naturally along the west FL coast including shell mounds and dunes . All records for in , Did You Know?, Showy flowers

Wildflower garden. This is a small but pretty little plant. Grow it in a moist wildflower garden. , Tolerance, Not salt tolerant of inundation by salty or brackish water. Low/no tolerance of salty wind or direct salt spray , Considertions, It may be necessary to re-seed to keep this in the garden. Seed is not generally commercially available. This is the most toxic of the milkweeds and i , Habitat, Flatwoods , Did You Know?, Showy flowers Larval host for the monarch butterfly (Danaus plexippus). Attracts various pollinators.