STANDLEY — TREES AND SHRUBS OF MEXICO. 163 



9. Salix thurberi' Rowlee, Bull. Torrey Club 27: 252. 1900. 



Salix longifolia angustissima Anderss. Ofv. Svensk. Vet. Akad. Forh. 15: 116. 



1858. 

 Coahuila and Nuevo Le6n ; Durango (?). Western Texas (type locality) and 

 southern New Mexico. 

 Medium-sized tree. 



10. Salix hartwegii Benth. PI. Hartw. 52. 1840. 



Mexico and Michoacan ; type from Aganguio, MichoacSn. 



Leaves elongate-lanceolate or narrowly elliptic-lanceolate, 3.5 to 9.5 cm. long. 



11. Salix mexicana Seemen, Bot. Jabrb. Engler 21: Beibl. 52: 9. 1895. 

 Hidalgo, Mexico, and Puebla ; type from ZacualtipSn, Hidalgo. 

 Shrub, 3 to 4.5 meters high. 



12. Salix schafenerii C. Sehneid. Bot. Gaz. 65: 30. 1918. 

 San Luis Potosi and Veracruz ; type from San Luis Potosf. 

 Leaves elliptic-lanceolate, 6 to 9 cm. long. 



13. Salix lasiolepis Benth. PI. Hartw. 335. 1857. 



Chihuahua and Coahuila to Baja California. California, the type from Mon- 

 terey. 



Tree or shrub. 3.5 to 9 or sometimes 16 meters high ; bark brown, rather thin, 

 fissured; leaves 6 to 10 cm. long; wood soft, weak', light brown, its specific 

 gravity about 0.56. "Ahuejote " (Baja California). 



14. Salix rowleei C. Sehneid. Bot. Gaz. 65: 31. 1918. 

 Salix rowleei cana C. Sehneid. Bot. Gaz. 65: 34. 1918. 

 Jlexico (State) ; type from Eslava. 



Shrub or tree, sometimes 6 meters high, the branchlets villosulous, the 

 branches blackish ; leaves elliptic or elliptic-lanceolate, about 7.5 era. long. 



15. Salix oxylepis C. Sehneid. Bot. Gaz. 65: 34. 1918. 



Salix latifolia Mart. & Gal. Bull. Acad. Brux. 10*: 344. 1843. Not. S. latifoUa 



Forbes, 1828. 

 Puebla and Veracruz ; type from Mount Orizaba. 

 Leaves ovate-elliptic or obovate-oblong, 3.5 to 4.5 cm. long. 



16. Salix paradoxa H. B. K. Nov. Gen. & Sp. 2: 20. 1817. 

 ? Salix pringlei Rowlee, Bot. Gaz. 27: 136. 1899. 



Salix paradoxa ajuscana C. Sehneid. Bot. Gaz. 65: 37. 1918. 

 Hidalgo to Oaxaca ; type from Mor^n, Hidalgo. 



Shrub or small tree, up to 6.5 meters high; leaves oblong-elliptic, elliptic- 

 lanceolate, or elliptic, 5 to 13 cm. long. 



17. Salix cana Mart. & Gal. Bull. Acad. Bruz. 10*: 344. 1843. 

 Mount Orizaba, the type locality, and perhaps elsewhere. 

 Leaves narrowly oblanceolate. 



DOUBTFUL SPECIES. 

 Salix endlichii Seemen, Repert. Sp. Nov. Fedde 5 : 19, 1908. Described from 

 the Sierra Madre of Chihuahua. Closely related, according to Schneider, to 

 S. cana. 



* George Thurber (1821-1890), a native of Rhode Island, was appointed in 

 1850 botanist to tlie United States commission to establish the boundary be- 

 tween the United States and Mexico. He spent five years in making botanical 

 collections, from the Gulf of Mexico to the Pacific Ocean, and discovered many 

 interesting plants, which were described by Gray. He is well known also for 

 his publications upon horticultural subjects. 



