Heuchera parviflora

KEY TO THE SPECIES AND VARIETIES OF THE HEUCHERA PARVIFLORA View in CoL GROUP

(partly based on Folk and Freudenstein 2015)

1. Petioles puberulent.................................................................................................................... 2

1. Petioles villous........................................................................................................................ 3

2. Stamens exserted. 1.7 mm, styles exserted. 1.7 mm, laminar hair length. 0.5 mm, leaf coriaceous, growing on calcareous alkaline substrates (dolomite or limestone)............................................................................................ H. puberula View in CoL

2. Stamens exserted almost always, 1.7 mm, styles exserted almost always, 1.7 mm, laminar hair length, 0.6 mm, leaf membraneous, growing on highly acidic substrates (gneiss)................................................................................ H. tuckasegeensis View in CoL 3. Flower orientation subhorizontal................................................................................. H. missouriensis View in CoL 3. Flower orientation pendent................................................................................................... 4 4. Leaf suede-like, not viscid at maturity, growing almost exclusively on sandstone substrates.............. H. parviflora var. parviflora View in CoL 4. Leaf viscid at maturity, growing exclusively on quartzite substrates.................................... H. parviflora var. saurensis View in CoL