Heuchera americana var. brevipetala Rosendahl, Butters & Lakela; H. americana var. heteradenia Fernald; H. americana var. subtruncata Fernald; H. calycosa Small; H. curtisii Torrey & A. Gray; H. curtisii var. crenata Rydberg; H. lancipetala Rydberg

Petioles glabrous or very short to sparsely long stipitate-glandular. Flowers: hypanthium free 0.6-1.5 mm, urceolate; petals greenish, white, or pink, narrower than sepals, margins entire or finely dentate. 2n = 14.

Flowering Apr-Jun. Rich woods often over base-saturated granite and gneiss, or in shallow, rocky soil; 70-1300 m; Ont.; Ala., Ark., Conn., Del., Ga., Ill., Ind., Ky., La., Md., Mich., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Va., W.Va.

Variety americana is widely distributed from Connecticut to Georgia and from southern Ontario and Ohio to Oklahoma and northwestern Louisiana. It intergrades with Heuchera pubescens and H. richardsonii where their ranges overlap, but not with H. longiflora, H. parviflora, or H. villosa, which also share overlapping ranges with it.