- Pleurisy Root, also known as Butterfly Weed, Canada Root, Silkweed, Swallow Wort, Tuber Root, Wind Root, Colic Root, and Orange Milkweed, is native to North America. It is a member of the milkweed family, but does not produce the milky juice commonly seen in its kin. Pleurisy Root usually grows to about a foot in height, and every summer it produces deep yellow and orange flowers. Pleurisy Root gets its name from its use as a support for pleurisy by the Natives. - Health-wise,only the root is us