518 



Saxifragaceae 



Heuchera 



50 



Map 1074 



Heuchera parviflora var Ruge 

 (Shuttlw. apud Kunze 

 Rosendahl Butters, 8, Lakela 



the lake area except the Vigo County specimen which was found in the 

 Heckland Prairie. 



Southern Mich, and Wis., southw. to 111. and Mo. 



2a. Heuchera Richardsonii var. Grayana Rosendahl, Butters, & Lakela. 

 (Rhodora 35: 117. 1933.) (Heuchera hispida of most authors.) Map 

 1072. This variety prefers a very sandy soil and is found both in moist and 

 dry situations in the open or in woodland bordering streams and lakes. 



Southern Mich, to Minn., southw. to Ind., Mo., and Kans. 



3. Heuchera villosa Michx. var. macrorhiza (Small) Rosendahl, But- 

 ters, & Lakela. (Heuchera macrorhiza Small.) Map 1073. Very local, in 

 the crevices of cliffs or rarely in the talus at their bases. It is restricted 

 to a few Ohio River Counties. Many years ago I dug some of the rhizomes 

 from the crevices of rock and planted them in neutral garden soil at Bluff- 

 ton, Wells County, and the plants are perfectly hardy and grow vigorously. 

 On account of their large and rather compact cluster of basal leaves and 

 large panicle of small white flowers I recommend it as a good garden plant, 

 especially for borders. 



W. Va., Ind., Ky., Tenn., and Mo., southw. to Ga. and Ala. 



4. Heuchera parviflora Bartl. var. Rugelii (Shuttlw. apud Kuntze) 

 Rosendahl, Butters, & Lakela. Map 1074. Our only specimen of this rare 

 alumroot is one which I found in a pocket on the perpendicular face of a 

 sandstone cliff on a farm about 2 miles southwest of Leopold, Perry 

 County. The leaves were quite purplish on the lower surface. 



W. Va., Ind., 111., southw. to N. C. and Ala. 



3198. MITELLA [Tourn.] L. 



Plants more than 2 dm high, generally 3-5 dm high; basal leaves ovate, middle lobe 

 acute; stem bearing 2 opposite, sessile or nearly sessile leaves; flowers white; 

 calyx cup-shaped 1- M - diphylla. 



Plants generally less than 2 dm high; basal leaves reniform, the lobes rounded; stem 

 naked, rarely with 1 or 2 leaves; flowers greenish; calyx saucer-shaped. See 

 excluded species no. 285, p. 1055.) M. nuda. 



