Rootstock creeping, scaly, thick, often a foot or more long. Leaves erect or ascending from the growing end of the rootstock, 2 to 10 inches long, divided into three leaflets, the petioles sheathing the stem at their bases. Leaflets usually obovate, blunt at the apex, narrowed at the base, 1 to 3 inches long. Flowers white, few or several, forming a cluster or raceme on a long, leafless stalk which rises from the rootstock. Each flower about one-half of an inch long; calyx five-lobed; corolla short funnel-form, five-lobed, densely bearded with white hairs within, the lobes spreading; stamens five, fastened to the inside of the corolla tube and shorter than the tube. Fruit an ovoid, blunt capsule about one-third of an inch long.
In bogs, marshes and wet places, Greenland to Alaska, south to Long Island, Pennsylvania, Nebraska and California. Flowering from May to July.
Memoir 15 N. Y. State Museum
Buckbkan; marsh trefoil Menyanthes trifoliatus