296 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



5. Heuchera versicolor Greene, Leaflets 1: 112. 1905. 

 Type locality: Damp shady bluffs in the Black Range, New Mexico. Type col- 

 lected by Metcalfe (no. 1203). 



Range: Mountains of southwestern New Mexico. 



New Mexico: Hillsboro Peak; Copper Mines; Mogollon Road. Transition Zone. 



6. Heuchera pulchella Woot. & Standi. Gontr. U. S. Nat. Herb. 16: 130. 1913. 

 Type locality: Crevices of rocks on the summit of the Sandia Mountains, New 



Mexico. Type collected by Wooton, August 4, 1910. 

 Range: Mountains of central New Mexico. 

 New Mexico: Sandia Mountains; headwaters of the Pecos. 



7. Heuchera nana (A. Gray) Rydb. N. Amer. Fl. 22: 111. 1905. 

 Heuchera rubescens nana A. Gray, PI. Wright, 2: 64. 1853. 



Type locality: Santa Rita, New Mexico. Type collected by Wright. 



Range: New Mexico and Arizona to northern Mexico. 



New Mexico: Frisco Canyon near Luna; Santa Rita. Mountains. 



2. SA3flFRAGA L. 



A small herbaceous perennial less than 20 cm. high, the stems arising from a root- 

 stock; leaves alternate, 5 to 7-lobed; inflorescence of a single terminal white flower 

 and a cluster of bulblets; follicles mostly undeveloped. 



1. Saxifraga cernua L. Sp. PI. 403. 1753. 



Type locality: "Habitat in Alpibus Lapponicis frequens." 



Range : Arctic regions south to Labrador, and in the Rocky Mountains to northern 

 New Mexico; also in the Old World. 



New Mexico: Top of Truchas Peak (Bailey 649). Arctic-Alpine Zone. 



3. MICRANTHES Haw. 



Perennial acaulescent herbs with very short caudices and solitary or numerous 

 scapes; leaves basal, long-petiolate or decurrent into a short and broad petiole; flowers 

 small, white, on crowded or paniculately branched cymes; hypanthium flat, shorter 

 than the calyx; follicles more or less divergent. 



KEY TO THE SPECIES. 



Leaf blades orbicular-reniform, on petioles several times as long; 



scapes 15 to 50 cm. high, widely branched above 1. M. arguta. 



Leaf blades lanceolate to ovate or oblong, on short petioles; scapes 

 25 cm. high or less, the inflorescence congested. 

 Bracts, calyx, scape, and lower surface of the leaves dark pur- 

 plish red; inflorescence open 2. M. eriophora. 



Whole plant green; inflorescence compact 3. M. rhomboidea. 



1. Micranthes arguta (D. Don) Small, N. Amer. Fl. 22: 147. 1905. 

 Saxifraga arguta I>. Don, Trans. Linn. Soc. Bot. 13: 356. 1822. 



Type locality: "Habitat ad oras occidentales Americae septentrionalis." 

 Range: British Columbia and Montana to California and New Mexico. 

 New Mexico: Santa Fe and Las Vegas mountains; Mogollon Mountains. Wet 

 slopes and along streams, Transition to Hudsonian Zone. 



2. Micranthes eriophora (S. Wats.) Small, N. Amer. Fl. 22: 142. 1905. 

 Saxifraga eriophora S. Wats. Proc. Amer. Acad. 17: 372. 1882. 



Type locality: Santa Catalina Mountains, Arizona. 

 Range: Mountains of southern Arizona and New Mexico. 

 New Mexico: Organ Peak (Wooton). Transition Zone. 



