STANDLEY TKEES AND SHRUBS OF MEXICO. 95 



Leaves 2 to 12 mm. wide, frequently brushlike at the tip ; bracts not very showy. 

 Leaves thin and grasslike, usually 3 to 5 mm. wide, rather flat, usually not 

 brushlike at the tip. 

 Pedicels slender, equaling or exceeding the fruit ; bracts not imbricate. 



Inflorescence 30 cm. long, the branches short 1. N. pumila. 



Inflorescence 25 to 30 cm. long, the branches stout, stiff 2. N. juncea. 



Pedicels stout, about half as long as the fruit ; bracts imbricate. 



Leaves 2 to 3 mm. wide; inflorescence 15 cm. long 3. N. humilis. 



Leaves 5 mm. wide; inflorescence 25 to 30 cm. long 4. N. watsoni. 



Leaves thick, 2 to 12 mm. wide, concave, keeled on one or both surfaces, often 

 brushlike at the tip. 

 Fruit somewhat inflated, the seed not protruding. 

 Leaves 4 to 5 mm. wide ; lower branches of the panicle much longer than 



the bracts 12. N. rigida. 



Leaves 6 to 12 mm. wide; lower branches of the panicle about as long 

 as the bracts. 



Fruit shorter than the pedicels, 6 to 7 mm. wide 10. N. durangensis. 



Fruit about as long as the pedicels, 7 to 10 mm. wide. 



Divisions of the inflorescence 15 to 45 cm. long; leaves 6 to 12 mm. 



wide 9. N. microcarpa. 



Divisions of the inflorescence 10 to 15 cm. long; leaves 12 mm. wide. 



11.. N. elegans. 

 Fruit not inflated, the seed early protruding. 



Inflorescence essentially smooth ; pedicels slender 8. N. palmeri. 



Inflorescence roughened in lines ; pedicels stout in fruit. 



Lower panicle divisions as long as the bracts 6. N. erumpens. 



Lower panicle divisions shorter than the bracts. 

 Branchlets of the lower panicle divisions short, stiff, spreading. 



7. N. cespitifera. 

 Branchlets of the lower panicle divisions weak, finally ascending. 



5. N. affiuis. 



1. Nolina pumila Rose, Contr. U. S. Nat. Herb. 10: 92. 1906. 



Known only from the type locality, in the Sierra Madre near Santa Teresa, 

 Tepic. 



Plants acaulescent ; leaves 20 to 30 cm. long, 2 to 4 mm. wide, with serrulate 

 margins ; inflorescence about 30 cm. long. 



2. Nolina juncea (Zucc.) Macbride, Contr. Gray Herb. n. ser. 56: 16. 1918. 

 Dasylirion junceum Zucc. Denkschr. Akad. Wiss. Muenchen 19: 19. 1845. 

 Dasylirion harticeg'ianum Zucc. Denkschr. Akad. Wiss. Muenchen 19: 21. 1845, 



nomen nudum. 

 Nolina hartivegiana Hemsl. Biol. Centr. Amer. Bot. 3: 371. 1884. 

 Known only from Zacatecas, the type locality. 

 Leaves 3 to 4 mm. wide ; inflorescence 25 to 50 cm. long. 



3. Nolina humilis S. Wats. Proc. Amer. Acad. 14: 248. 1879. 



Known only from the original collection, from the region of San Luis Potosl. 

 Acaulescent ; leaves 60 cm. long, 2 to 3 mm. wide, with very rough margins ; 

 inflorescence 15 cm. long. 



4. Nolina watsoni (Baker) Hemsl. Biol. Centr. Amer. Bot. 3: 372. 1884. 

 Beaucarnea watsoni Baker, Journ. Linn. Soc. Bot. 18: 236. 1880. 



San Luis Potosl. 



Leaves 5 mm. wide, with very rough margins ; inflorescence 25 to 30 cm. long. 



5. Nolina affinis Trel. Proc. Amer. Phil. Soc. 50: 417. 1911. 

 Nolina caudata Trel. Proc. Amer. Phil. Soc. 50: 417. 1911. 



