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

• Generated Map
• Legacy Map

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.

"full" is not a number."narrower" is not a number.