100 CONTRIBUTIONS FROM THE NATIONAL. HERBARIUM. 



1. Dasylirion cedrosanura Trel. Proc. Amer. Phil. Soc. 50: 431. 1911. 

 Coahuila and Zacatecas; type from Cedros, Zacatecas. 



Trunk 1 to 1.5 meters high ; leaves 2 cm. wide, glaucous ; inflorescence 5 

 metei-s high. 



2. Dasylirion lucidum Rose, Contr. U. S. Nat. Herb. 10: 90. 1906. 

 Puebla ; type from TehuacSn. 



Trunk 1 to 2 meters high; leaves 1 to 1.7 cm. wide, smooth and lustrous; 

 inflorescence 2 to 3 meters high. 



3. Dasylirion palmeri Trel. Proc. Amer. Phil. Soc. 50: 432. 1911. 

 Known only from the type locality, San Lorenzo Canyon, Coahuila. 



Plants 2.5 to 3 meters high ; leaves about 1 meter long, green or slightly 

 glaucous, smooth, dull. " Sotol." 



The leaves, deprived of the spines, are used for making brooms. 



4. Dasylirion parryanum. ^ Trel. Proc. Amer. Phil. Soc. 50: 432. 1911. 

 San Luis Potosi, the type from the vicinity of San Luis Potosl. 

 Leaves dull, minutely roughened. 



5. Dasylirion leiophyllum Engelm. ; Trel. Proc. Amer. Phil. Soc. 50: 433. 



1911. 

 Chihuahua. New Mexico and western Texas; type from Presidio, Texas. 

 Stem short ; leaves about 1 meter long, green or glaucescent, smooth, rather 

 lustrous. 



6. Dasylirion texanum Scheele. Linnaea 23: 140. 1850. 



Dasylirion texanum aberrans Trel. Proc. Amer. Phil. Soc. 50: 434. 1911. 

 Coahuila and Nuevo Leon. Texas; type from New Braunfels. 

 Trunk very short or subterranean ; leaves 1 meter long or shorter, green, lus- 

 trous ; inflorescence 3 to 5 meters high. " Sotol " (Texas). 



7. Dasylirion simplex Trel. Proc. Amer. Phil. Soc. 50: 434. 1911. 

 Durango ; type from Tepehuanes. 



Plants 1.5 meters high ; leaves about a meter long, green, smooth, lustrous. 

 " Sotol." 



The leaves are employed for making baskets, and for the " sopladores " used 

 to fan charcoal fires. 



8. Dasylirion longistylum Macbride, Contr. Gray Herb. n. ser. 56: 16. 1918. 

 Known only from the type locality, Minas de San Rafael, San Luis Potosl. 

 Leaves 5 to 7 mm. wide, glaucous-green, smooth, the margin with large remote 



teeth ; fruit 5 mm. wide. 



9. Dasylirion glaucophyllum Hook, in Curtis's Bot. Mag. II. 14: pi. SO.'/l. 



1858. 



Dasylirion glaucum Carr, Rev. Hort. 44: 435. 1872. 



Known in Mexico only from the type locality, Real del Monte. Hidalgo; also 

 in cultivation in Europe. 



Trunk short ; leaves 1 meter long or.longer, aboiit 1.2 cm. wide, dull ; inflores- 

 cence 4 to 6 meters high. 



10. Dasylirion acrotriclie (Schiede) Zucc. Denkschr. Akad. Wiss. Miinchen 

 16: 226. 1840. 



* Named for C. C. Parry (1823-1890), at one time botanist of the U. S. 

 Department of Agriculture, who made extensive collections of plants in the 

 United States, especially in the Rocky Mountains. In 1878, in company with 

 Edward Palmer, he collected a large series of Mexican plants, chiefly in the 

 State of San Luis Potosl. 



