Petioles densely long stipitate-glandular. Flowers: hypanthium free 1.1–2 mm, campanulate; petals greenish, white, or pink, narrower than sepals, margins nearly entire or finely dentate. 2n = 14.

Phenology: Flowering Apr–Jun.
Habitat: Rich woods or open grasslands often over base-saturated granite and gneiss, or in shallow rocky soil
Elevation: 200-400 m

Distribution

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Ark., Ill., Ind., Mich., Mo., Okla.

Discussion

Variety hirsuticaulis occurs in a band from Oklahoma to Michigan, where var. americana and Heuchera richardsonii overlap; it is intermediate between those taxa in floral characters but is densely long stipitate-glandular like H. richardsonii. It is probably the result of introgression from H. richardsonii from as long ago as the Pleistocene migrations. Data from a breeding study involving the two species showed a tendency for the shorter hypanthium of var. americana to dominate in the artificial hybrids between H. americana and H. richardsonii (E. F. Wells 1979).

Selected References

None.

Lower Taxa

None.