70 Trans. Acad. Sci. of St. Louis. 



pubescent, oblong, cleft to the middle. Dry sandy mesas; 

 common south westward. July to October. Perennial. 



Lower Sonoran area. Texas to New Mexico, Utah, Ne- 

 vada, Arizona, California, Mexico and Colorado. 



Type locality : "In subfrigidis, siccis, apricis regni Mexi- 

 cana inter Guanaxuato, Mina de Belgrado et Cubilente, alt. 

 lOSOhexap." 



Specimbxs examined. — Texas : Chenate Mountains, Presidio County, 

 Nealley, 826; Sierra Blanca, Nealley, 1893.— Colorado: San Juan, Br andegee, 

 1203, 1875 —New Mexico: Las Cruces, TFooton, 457, 1897; no locality given, 

 Wright, -2059, Parry, 1867.— Utah: No locality given, Parry, 260, 1874.— 

 Arizona: Cienega, Bothrock, 575, 1874; Tucson, Tourney, 89, 1894; no 

 locality given, Pringle, 540, 1882. — California: Los Angeles, Palmer, 500, 

 652 and 1359. — Mexico: No locality given, Schaffner; Durango, Palmer, 

 740, 1896. 



8. Triodia pulchella parviflora Vasey, Gr. U. S. Q6. 



1885. 



Sieglingia pulchella parviflora (Vasey). Dewey, Contr. U. S. Nat. Herb. 

 2:538. 1894. 



Culms I dm. tall, slender, fasciculately branched from a 

 stoloniferous base. Leaves .5-1.5 cm. long, fasciculate, in- 

 volute; panicles very slender, leafy, verticillate ; spikelets 

 3_4.tlowered, 3-6 mm. long, white; flowering scales 2-3 

 mm. long, pubescent, oblong, cleft to the middle. Dry 

 sandy mesas. August to October. Perennial. 



Lower Sonoran area. Texas and Arizona to California. 



Type locality not ascertained. 



Specimens examined. — California: San Diego County, Orcutt, 1487, 



U 



9. Triodia Texana (Thurb.) Benth. ex Wats. Proc. Am. 



Acad. 18 : 180. 1883. 



Tricuspis Texana Thurb. S. Wats. Proc. Am. Acad. 18 : 180. 1883. 

 Sieglingia Texana (Thurb.) O. Kuntze, Rev. Gen. PI. 2 : 789. 1891. 



Culms 3-5 dm. tall, slender, leafy. Leaves 2-3 dm. long, 

 often exceeding the panicle; spikelets 6-10-flowered, 6-12 

 mm. long; lower scales unequal, about one-half as long as 

 the adjacent flowers; flowering scales broadly ovate or ro- 

 tund ; palet broadly ovate or almost hastate lobed at the base. 



