Perennial by long rootstocks, rooting in the mud or in the water, stem erect, glabrous, or somewhat pubescent, enlarged at the nodes, 1 to 3 feet high. Leaves ovate-lanceolate or oblong-lanceolate, the upper ones often narrower, 2 to 8 inches long, acute or acuminate at the apex, rounded or cordate at the base, petioled, ocreae cylindric, becoming loose, not ciliate. Flowers in linear-oblong, dense, terminal racemes, 1 to 3 inches long; calyx dark rose-colored, five-parted; stamens five in number.

In swamps, marshes and moist soil, Ontario to British Columbia, Virginia, Louisiana and Mexico. Flowering from July to September.

Memoir 15 N. Y. State Museum

Plate 47

A. Swamp Smartweed

A. Swamp Smartweed - Persicaria muhlenbergii b. ladys-thumb; heartweed Persicaria persicaria