Asclepias perennis (Aquatic Milkweed)
Botanical name: Asclepias perennis
Common names: Aquatic Milkweed, White Swamp Milkweed
Family: Apocynaceae
Origin: North America
USDA Plant Hardiness Zone Map
Found in low wet woods, cypress swamps, lake and pond margins, slow streams, and wet ditches.Like all members of the Asclepias genus, it is a larval host plant for Monarch, Queen and Soldier butterflies. Swamp milkweed works well in mixed butterfly and wildflower gardens planted along pond edges or similar moist sites. It also does well in a container.
Similar plants: Asclepias perennis (Aquatic Milkweed)
Link to this plant:
https://toptropicals.com/catalog/uid/asclepias_perennis.htm