11. Heuchera alba Rydberg, Torreya. 26: 31, plate 2. 1926.
Herbs acaulescent; caudex branched. Flowering stems often leafy, 26-77 cm, short stipitate-glandular. Leaves: pet-iole glabrous or short stipitate-glandular; blade broadly ovate to cordate, shallowly 5-lobed, 4.5-9 cm, base cordate or nearly truncate, lobes rounded to widely ovate, margins dentate, apex acute or obtuse, surfaces glabrous or sparsely stipitate-glandular, at least on veins. Inflorescences diffuse. Flowers: hypanthium moderately bilaterally symmetric, free 3.5-4.5 mm, green, campanulate, abruptly inflated distal to adnation to ovary, 7.5-11 mm, short stipitate-glandular; sepals spreading, green-tipped, equal, 3-4 mm, apex rounded (sinuses narrower than petals); petals inflexed, white, broadly spatulate, unlobed, 2.8-3.5 mm, margins fimbriate; stamens 2 mm included to 2 mm exserted; styles included 0.5-1 mm, 4-6 mm, to 0.1 mm diam. Capsules ovoid, 9-10 mm, beaks divergent, not papillose. Seeds dark brown, ellipsoid, 0.6-1 mm.
Flowering May-Jun. Shaded or exposed sandstone rock outcroppings, ridges, and peaks; of conservation concern; 1300-1500 m; Va., W.Va.
Heuchera alba occurs on sandstone ridges in the Ridge and Valley Province.