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A deciduous spreading shrub, with stems up to 6 ft long, lax, but scarcely climbing. Leaves oval, obovate or oblong, 2 to 4 in. long, 11⁄4 to 21⁄2 in. wide, glaucous and slightly downy beneath, more glaucous on the upper side, one or more of the upper pairs are united at the base, and form a roundish disk clasping the stem; of thickish substance. Flowers yellow, not fragrant, produced in June at the end of the current season’s growth in a terminal stalked spike, composed of two or more whorls, sometimes branched at the base. Corolla two-lipped, about 1 in. long, the tube longer than the lips, slender, slightly swollen on one side; glabrous outside; style slightly hairy. Berries reddish yellow, 1⁄4 to 1⁄2 in. diameter.
Native of central N. America; long grown in gardens – in early times as “L. flava”, which is a rarer and more beautiful shrub than L. prolifera. The latter is closer to L. dioica, a species distinguished by its shorter corolla, the tube of which is about as long as the lips, the leaves and style quite glabrous. L. prolifera does not need a support except when quite young and may be grown in the open as an elegant, loose bush.