Heuchera americana var. americana
Heuchera americana var. hispida
American alumroot
American alumroot, stiffly short-hair or hairy alum-root
glabrous or very short to sparsely long stipitate-glandular.
glabrous or very short stipitate-glandular.
hypanthium free 0.6–1.5 mm, urceolate;
petals greenish, white, or pink, narrower than sepals, margins entire or finely dentate.
hypanthium free 1.5–2 mm, campanulate;
petals purple or pink, wider than sepals, margins fimbriate.
= 14.
= 14.
Heuchera americana var. americana
Heuchera americana var. hispida
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety hispida occurs in the mountains and hills of western Maryland and Virginia, eastern West Virginia, and Surry County, North Carolina, where var. americana and Heuchera pubescens overlap; it is intermediate between var. americana and H. pubescens in floral characters. Variety hispida was confused with H. richardsonii for almost a century, beginning in 1849 when Gray reduced H. richardsonii to synonymy under H. hispida, after some seeds of H. richardsonii germinated among H. hispida plants in a labeled plot and later replaced them (C. O. Rosendahl et al. 1933).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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