191 ■•] TRELEASE— THE DESERT GROUP XOLIXE^. 421 



Santa Catalina Mountains (Pringlc, 1881, 1882, 1884). Santa Rita 

 Mountains {Pringlc, 1882; Brandcgcc, 1891). Without locality 

 {Tourney, 44^, 1892). Sun Flower Valley (Girard, i, 1873). Blue 

 River {Davidson, jj^, 1902). Xew ^Iexico. Santa Rita del Cobre 

 {Greene, \%^o). Burro Mountains (i?r/^t_v, ^/j, 1881. — fruit; Gold- 

 man, 1530, 1908). Dog [Mountains {Mcarns, 2Q4, 1892). Lone 

 Mountain {Mulford, 42/, 42^, 1895). Otero County {Relin & 

 Jlereck, 1902). Round Mountain {?JVooton, 1905, — very narrow- 

 leaved, as in tesana). Mogollon ^Mountains {Ritsby, 412, 1881 ; 

 Metcalfe, 232, 1903). Alimbres River {Metcalfe, 102=,, 1904). San 

 Luis Pass {Mearns, 186, 1892; IVooton, 1906). Twin Sisters 

 ( ?Blunier, 1905). Silver City ( IBailey, 1906). Big Hatchet Moun- 

 tains {Goldman, 1341, 1908). Boundary Lixe {Parry, Bigeloiv, 

 Wright & Schott, 1442). Chihuahua. Colonia Garcia (Toz^nisend 

 & Barber, yd, 1899). X'icinity of Chihuahua {IPringlc, i^p, 1885; 

 Palmer, 333, 1908). 



N. durangensis Trelease. 



Leaves very thin, 7-1 1 or even 20 mm. wide, irreg- 

 ularly serrulate-scabrous. Inflorescence with broad 

 divisions at length 15-20 cm. long and chiefly basal 

 branchlets 10-12 cm. long. Fruit usually considerably 

 shorter than the rather slender pedicels, more or less 



depressed, small, 5-6 X 6-7 mm. Seed 3 mm. in diameter. — PI. 10. 

 Northwestern Mexico. In the region of Dasylirion durangense 



and simplex. 



Specimens examined : Durango. Vicinity of Durango (Pfl/;ne'r, 



24P, 1896, — the type ; Ochotcrena, 191 1 ; Patoni, 1911). Tepehuanes 



{Palmer, 32^, 1906). Chihuahua. Southwestern Chihuahua 



{?Endlich, 1162a, 1162b, 1906). 



N. ELEGANS Rose. Coutr. U. S. Xat. Herb. 10: 91. /. 6. 

 Leaves very thin, 12 mm wide, sometimes lanceo- 



lately narrowed above the base, serrulate-scabrous. 



Inflorescence with broad divisions 10-15 cm. long and 



rather few branchlets scarcely half as long. Fruit 



about equaling the pedicels, rather large. 7 X 8-10 



mm. Seed 3X4 mni. 



