Jeffersonia diphylla (L.) Pers.
Other common names: Jeffersonia, rheumatism root, helmetpod, ground-squirrel pea, yellowroot.
Habitat and range: Twinleaf inhabits rich shady woods from New York to Virginia and westward to Wisconsin.
Description: Twinleaf is only about 6 or 8 inches in height when in flower but reaches a height of 18 inches at the fruiting stage. The long-stemmed, smooth leaves are almost completely divided into two leaflets and arise directly from the base of the plant. The white flowers measuring about 1 inch across. which appear early in spring, are borne singly on a slender stalk arising from the root and are followed by a leathery, somewhat pear-shaped capsule containing many seeds. Twinleaf has a thick, knotty, yellowish-brown, horizontal root. stock with man fibrous, much-matted roots.
Part used: The rootstock, collected in autumn.
