Stems ascending or erect, branched above, 6 inches to 3 or 4 feet high and frequently reclining on surrounding vegetation, visually hairy, reddish or brown. Leaves bright green, three-fourths to 1½ inches broad on petioles 1 to 3 inches long; leaflets broader than long, sharply notched. Flowers yellow, in forking cymes; each flower on a pedicel one-fourth to one-third of an inch long, which is more or less hairy and erect or ascending. Sepals five, lanceolate or narrowly elliptic, one-sixth to one-fourth of an inch long, spreading in fruit; petals five, obtuse or notched at the apex, one-third to nearly one-half of an inch long. Fruit a slender, columnar, erect capsule, about one-half of an inch long, gradually narrowed to the summit; seeds obovoid-oblong with nearly continuous ridges.
Memoir 15 N. Y. State Museum
B. Tall Yellow Wood Sorrel - Xanthoxalis cymosa
There are several closely related species of Yellow Sorrel. Those of the northeastern states are illustrated and described by Britton & Brown (Illus. Flora, 2: 432-35, ed. 2) (X. stricta, X. bushii, X. rufa and X. brittoniae).