Family, Crowfoot. Color, white. Petals, none. Sepals, large, looking like petals, softly silky underneath. Pistils and stamens, numerous. Fruit, a cylindrical head which suggests the common name of thimbleweed. Achenes, flat, clothed with long, woolly hairs. Leaves, compound or dissected, from the root. The stem bears, some distance below the flowers, an involucre of long-petioled, lance-shaped, thin leaflets. May, June.

A tall species with showy flowers. The stem branches above into 2 or more single-flowered peduncles. River-banks from Maine to eastern Pennsylvania.

A cylindrica is a slender, silky-stemmed plant, with a whorl of involucral, 3-divided leaves half-way up the main stem, from which spring 2 or 3 naked flower - stalks, or perhaps a single peduncle having a second whorl of smaller, cut leaves. Plant about 2 feet high, with greenish-white sepals.

These two species are very similar. Attention to their foliage will enable one to distinguish between them.