22O 



SAXIFRAGACEAE. 



VOL. II. 



3. Heuchera villosa Michx. Hairy 



Heuchera. Fig. 2175. 

 H. villosa Michx. Fl. Bor. Am. i: 172. 1803. 



Stem erect, leafless, or rarely bearing a 

 few small leaves below, generally villous- 

 pubescent with brownish hairs, as are also 

 the long petioles and the veins on the lower 

 surfaces of the leaves. Basal leaves 3'-$' 

 wide, ovate to orbicular, sharply or obtusely 

 and deeply 7-9-lobed, the lobes dentate or 

 serrate, the terminal lobe usually longer 

 than wide; flowering calyx i"-ii" long, 

 campanulate, regular ; petals linear-spatu- 

 late, white or nearly so, twice as long as 

 the calyx-lobes or more ; stamens much 

 exserted. 



In rocky places, Virginia, West Virginia and 

 Kentucky to Georgia and Tennessee. June- 

 Sept. Called also American sanicle. 



4. Heuchera macrorhiza Small. Big-rooted 

 Heuchera. Fig. 2176. 



H. macrorhiza Small, Bull. Torr. Club 25 : 466. 1898. 



Stem erect, usually leafless, stout, from a very 

 thick scaly rootstock, densely yillous or hirsute- 

 villous with usually sordid hairs. Basal leaves, 

 3'-8' wide, suborbicular in outline, shallowly 

 lobed, with the terminal lobe usually wider than 

 long, the teeth broad, mucronate ; flowering calyx 

 short-hairy, often larger than in H. villosa, regu- 

 lar; petals linear or nearly so, about twice as 

 long as the calyx-lobes or less; stamens much- 

 exserted. 



On bluffs and river banks, West Virginia, Ken- 

 tucky and Tennessee. July-Oct. 



Heuchera crinita Rydb., from Kentucky and ad- 

 jacent states, seems to be a robust form of H. mac- 

 rorhiza. 



5. Heuchera americana L. 



Fig. 2177. 



Alum-root. 



Heuchera americana L. Sp. PL 226. 1753. 



Stem rather stout, 2-3 high, leafless, more 

 or less glandular-hirsute. Basal leaves long- 

 petioled, 3' -4' wide, with 7-9 rounded crenate- 

 dentate lobes, the older ones glabrous, or with 

 scattered hairs on the upper surface ; flowering 

 calyx broadly campanulate, nearly regular, 

 ii"-3" long; petals very small, greenish, 

 usually not exceeding the calyx-lobes; stamens 

 much exserted ; anthers orange. 



In dry or rocky woods, Ontario to Connecticut, 

 west to Minnesota, south to Alabama and Louisi- 

 ana. Ascends to 3000 ft. in Virginia. American 

 sanicle. Common alum-root. May-Aug. 



Heuchera lancipetala Rydb., from Kentucky, 

 has a leafless flower-stem as in H. americana; but 

 the petals are much longer than the calyx-lobes. 



