158 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves of the same color on both surfaces. 



Leaves long-lanceolate; a compact, spread- 

 ing tree 16. S. nigra. 



Leaves shorter; a straggling tree or shrub. .15. S. wrightii. 



1. Salix saximontana Rydb. Bull. N. Y. Bot. Gard. 1: 261. 1899. 

 Type locality: Grays Peak, Colorado. 



Range: New Mexico to Montana and westward. 



New Mexico: Taos Mountains; Truchas Peak. Alpine summits, in the Arctic- 

 Alpine Zone. 



A densely cespitose plant, less than 10 cm. high, with small, elliptic, obtuse <>r 

 acute, entire leaves, these green above, glaucous beneath, on slender petioles. In 

 New Mexico known only from the tops of the highest peaks in the northern part of 

 the State. 



2. Salix bebbiana Sarg. Gard. & For. 8: 463. 1895. 



Salix perrostrata Rydb. Bull. N. Y. Bot. Gard. 2: 163. 1901. 



Type locality: British America. 



Range: From New Mexico northward and eastward. 



New Mexico: Santa Fe and Las Vegas mountains; Raton; Catskill; El Rito Creek; 

 Chama; Zuni Mountains; Mogollon Mountains; White Mountains. Along streams in 

 the mountains at middle elevations, in the Transition Zone. 



3. Salix scouleriana Barratt; Hook. Fl. Bor. Amer. 2: 145. 1839. 

 Salix flavescens Nutt. N. Amer. Sylv. 1: 65. 1842. 



Salix nuttaUii Sarg. Gard. & For. 8: 463. 1895. 



Type locality: "North West America, on the Columbia. Dr. Scouler. Fort 

 Vancouver. Tolmie." 



Range: New Mexico to Alberta and westward. 



New Mexico: Tunitcha Mountains; Sierra Grande; Beulah; Zuni Mountains; 

 Eao-le Peak; Black Range; Magdalena Mountains; Cloudcroft. Along mountain 

 streams, in the Transition and Canadian zones. 



Similar to the next in appearance, but the leaves of a different shape and the charac- 

 ters of the inflorescence conspicuously different. It comes into our range from the 

 west, while S. bebbiana comes into New Mexico from the east. 



4. Salix chlorophylla Anderss. Vet. Akad. Handl. Stockholm 6: 138. 1867. 

 Type locality: Western Canada. 



Range: New Mexico, Utah, and California and northward. 



New Mexico: Pecos Baldy; top of Las Vegas Range; Taos Mountains. In the 

 higher mountains, in the Arctic-Alpine Zone. 



A low branching shrub, only a few, often not more than two decimeters high; leaves 

 thin elliptic-ovate, 2 to 3 cm. long, usually entire and acute, paler and slightly 

 glaucous beneath. 



5. Salix petrophila Rydb. Bull. N. Y. Bot. Gard. 1: 268. 1899. 

 Salix arctica petraea Anderss. in DC. Prodr. 16: 287. 1864. 

 Type locality: "In summis Rocky Mountains." 



Range: New Mexico, Colorado, Utah, and northward. 



New Mexico: Truchas Peak; Taos Mountains. Among rocks on alpine summits, 

 in the Arctic-Alpine Zone. 



A low, creeping plant, 10 cm. high or less, with glabrous, yellowish or brown stems 

 and elliptic, green leaves 3 cm. long or less, found only on very high peaks in the 

 northern part of the State. 



6. Salix glaucops Anderss. in DC. Prodr. 16: 281. 1868. 

 Salix seemanii Rydb. Bull. N. Y. Bot. Gard. 2: 164. 1901. 

 Salix wyomingensis Rydb. Bull. Torrey Club 28: 271. 1901. 



