This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Color, pale greenish yellow. Leaves, thin, downy beneath when young, on somewhat hairy, short petioles, opposite, oblong or ovate, fringed around the margins. Calyx, with very short teeth. Corolla, funnel-form, with a slight, spurlike swelling at base, 3/4 of an inch long, with 5 nearly equal lobes. Stamens, 5. Fruit, not united, of 2 separate, bright red berries. April to June.
Erect, 3 to 5 inches high. In cold, moist woods from Pennsylvania to Michigan, Wisconsin, and northward.
 
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