Heuchera richardsonii

This species is a northern Plains element -- although as often found in forest fragments as in open plains, and still often preferring rocks or rocky soil. The flowers are most similar to Heuchera longiflora, but the hairy petioles and deep leaf sinuses are distinctive.

South Dakota:

These pictures are from cultivated plants collected in the Black Hills area of South Dakota -- what Rosendahl et al. would have mostly called "var. typica", the plants generally smaller and less hairy. Commonly, the floral mouth is almost completely closed, whereas the mouth tends to be more open in southern material.

Iowa:

These more easterly populations generally have larger, hairier leaves and larger inflorescences. This would be called "var. grayana".