Family, Rue. Color, greenish white. Lean 3-foliate. Leaflets, ovate, pointed, downy, at least when young. Calyx, petals, and stamens, 3 to 5. Style, 1, bearing 2 stigmas. Fruit, a round-winged, 2-celled, 2-seeded samara, bitter, used as a substitute for hops. Flowers, unpleasantly scented, in compound, flat clusters terminating the branches. June.

Often cultivated. Wild in rocky places from Long Island to Minnesota and southward.