WOOTON AND STANDLEY FLORA OF NEW MEXICO. 161 



16. Salix nigra Marsh. Arb. Amer. 139. 1785. Black willow. 

 Type locality: North America. 



Range: California to Colorado and New Mexico, and eastward. 



New Mexico: Gila; Dog Spring; Emory Spring; Grant County; White Sands. 

 Lower and Upper Sonoran zones. 



It is very probable that further study of what is here considered -S". nigra in New 

 Mexico will show that it belongs to S. wrightii, which is the common plant of the type. 

 The leaves of our specimens are firmer than those of the eastern form and usually 

 broader. 



17. Salix bonplandiana H. B. K. Nov. Gen. & Sp. 2: 24. pi. 101, 102. 1817. 

 Type locality: "In Regno Mexicano, locis opacatis prope Moran, Cabrera, Omitlan 



et Pachuca, alt. 1270-1350 hexap." 



Range: Arizona and New Mexico to Mexico. 



New Mexico: San Luis Mountains {Mearns 2189, 2434). 



18. Salix argophyUa Nutt. N. Amer. Sylv. 1: 71. 1842. 



Type locality: "On the Boise River, toward its junction with the Shoshonee," 

 Idaho. 



Range: Washington and Oregon to Idaho and New Mexico. 



New Mexico: Chama; Shiprock; Reserve. Along streams, in the Upper Sonoran 

 and Transition zones. 



With us a shrub 2 to 3 meters high. 



19. Salix amygdaloides Anderss. Proc. Amer. Acad. 4: 53. 1858. 

 Type locality: Fort Pierre, South Dakota. 



Range: British Columbia and Quebec, southward to New York, Texas, and 

 Oregon. 

 New Mexico: Shiprock; Farmington. Along streams, in the Upper Sonoran Zone. 

 This becomes a tree 10 meters high. 



20. Salix subcaerulea Piper, Bull. Torrey Club 27: 400. 1900. 

 Salix covillei Eastwood, Zoe 5: 80. 1900. 



Salix pachnophora Rydb. Bull. Torrey Club 31: 402. 1904. 



Type locality: Powdel" River Mountains, in wet meadows near the head of Eagle 

 Creek, Oregon. 



Range : Oregon and Montana to California and New Mexico. 



New Mexico: Along Willow Creek, Rio Arriba County {Standley 6702). Along 

 streams and in wet meadows, in the Transition and Canadian zones. 



A tree 5 meters high or less. 



Order 18. JUGLANDALES. 

 31. JUGLANDACEAE. Walnut Family. 



A small family of large or small trees and large shrubs, of considerable economic 

 importance on account of the value of their wood for various purposes and because 

 of their edible seeds generally called "nuts"; leaves pinnately compound, the leaflets 

 mostly large; flowers monoecious, the sterile flowers in catkins, the fertile solitary 

 or few together in short spikes. 



The family contains the well known black walnut and the English walnut of com- 

 merce, the hickory nut, and the pecan. Only a single genus occurs native in our 

 range, but the pecan is cultivated in a few localities. 

 52576°— 15 11 



