Appendix 1.

Voucher information for accessions used in this study.

Species	Herbarium voucher no. (Herbariuma)	Collection locality	Geographic coordinates
Heuchera abramsii Rydb.	Folk 45 (OS)	Mount Baldy, CA, USA	34°17.423′N, 117°38.738′W
H. acutifolia Rose (herbarium specimen)	Matus 14560 (TEX)	Rancho Poza, VER, Mexico	20°32′10.38″N, 98°28′51.58″W
H. americana L. var. americana	Folk 70 (OS)	Berry Road, Wayne National Forest, OH, USA	38°36′9.11″N, 82°20′22.16″W
H. elegans Abrams	Folk 44 (OS)	Talus above road to Crystal Lake, 0.5 mi. from Hwy. 39, CA, USA	43°18.940′N, 117°50.537′W
H. grossulariifolia Rydb. var. grossulariifolia (tetraploid)	Folk 160 (OS)	Cliff above roadside parking lot outside of Riggins, ID, USA	45°24′40″N, 116°19′35″W
H. missouriensis Rosend.	Folk I-69 (OS)	Little Grand Canyon near Carbondale, IL, USA	37°41′4.46″N, 89°24′38.92″W
H. parishii Rydb.	Folk 43 (OS)	Sugarloaf Mountain, CA, USA	34°12.003′N, 116°47.621′W
H. parviflora Bartl. var. parviflora	Folk 72 (OS)	Natural Bridge State Park, KY, USA	37°46′26.33″N, 83°40′51.39″W
H. parvifolia var. nivalis (Rosend., Butters & Lakela) Á. Löve, D. Löve & B. M. Kapoor	Folk 55 (OS)	Along Rock Creek Hills Road, Lost Park, CO, USA	39°20′59″N, 105°41′25″W
H. puberula Mack. & Bush	Folk 69 (OS)	Pea Vine Road near Big Springs, Ozark National Riverways, MO, USA	36.94794°N, 90.99215°W
H. pulchella Wooton & Standl.	Folk 20 (OS)	Sandia Crest, NM, USA	35°12.662′N, 106°27.029′W
H. rubescens Torr. var. versicolor (Greene) M. G. Stewart	Folk 26 (OS)	Outcrop above Hwy. 159, NM, USA	33°22′14″N, 108°41′34″W
H. villosa Michx. var. villosa	Folk I-1 (OS)	Devil’s Courthouse, NC, USA	35°18′9.44″N, 82°53′44.39″W
H. wootonii Rydb.	Folk 22 (OS)	Dry bank, Capitan Peak, NM, USA	33°36′45″N, 105°14′45″W
Mitella pentandra Hook.	Folk 128 (OS)	Pacific Crest Trail access from Hwy. 90, WA, USA	47 25′40″N, 121 24′48″W

^aOS = Ohio State University Herbarium; TEX = University of Texas at Austin Herbarium.