New York southward and westward.
Flowers: solitary; growing on a naked scape. Calyx: of four petals that fall early. Corolla: one inch broad, of eight petals. Stamens: eight. Pistil; one;
stigma, two-lobed. Leaves: from the base; growing on long stalks, and parted into two rounded leaflets which have won for it the name of twin-leaf. Scape: simple; naked.
The generic name of this pretty little perennial herb was bestowed on it in honour of Thomas Jefferson. It comes to us early in the season, but is only found sparingly in woods that are east of New York.