HITCHCOCK—MEXICAN GRASSES. 343 
21. Bouteloua juncea (Desv.). 
Triathera juncea Desv.; Beauv. Ess. Agrost. 40. pl. 9. f. 4. 1812. 
Triaena racemosa H. B. K. Nov. Gen. & Sp. 1: 179. pl. 61. 1816, not Bouteloua 
racemosa Lag. 1805. 
Eutriana triaena Trin. Gram. Unifl. 239. 1824. 
Bouteloua triaena Scribn. Proc. Acad. Phila. 1891: 307. 1892. 
Triaena juncea Griffiths, Contr. U.S. Nat. Herb. 14: 354. 1912. 
Type locality unknown. 
RanGE: Central and southern Mexico. 
HERBARIUM SPECIMENS: 
CoaHUILA: Saltillo, Griffiths 8408. 
Hipatao: Dublan, Griffiths 8117, 8122. El Salto, calcareous soil, Pringle 9573. 
Pursia: Tehuacan, hills east of city, Rose, Painter & Rose 10117; Hitchcock 6074; 
Ross 1302a. Chalchicomula, rocky hill, Hitchcock 6302. 
More Los: Jojutla, limestone hills, Pringle 8708. 
Oaxaca: Valley of Oaxaca, Nelson 1542. Dominguillo, Nelson 1842. Las Sedas, 
dry calcareous hills, Pringle 4782; Conzatti & Gonzdlez 265. Oaxaca, rocky 
hill, Hitcheock 6146. 
Yucatan: Nohcacab, Schott 740. 
22. Bouteloua disticha (H. B. K.) Benth. Journ. Linn. Soc, Bot, 19: 105. 1881. 
Polyodon distichum H. B. K. Nov. Gen. & Sp. 1: 175. pl. 55. 1816. 
Type locality, ‘‘In montosis, alsis Regni Quitensis.”’ 
RANGE: Yucatan to South America, also in Cuba. 
HERBARIUM SPECIMEN FROM MEXICO: 
YucatdAn: Noheacab, Schott 741. 
23. Bouteloua texana §. Wats. Proc. Amer. Acad. 18: 196. 1883. 
Type locality, ‘‘Western Texas.” 
Range: Texas and adjacent Mexico. 
HERBARIUM SPECIMEN FROM MEXICO: 
CoanuILaA: Diaz, calcareous mesas, Pringle 9018. 
24. Bouteloua chondrosioides (H. B. K.) Benth. in 8. Wats. Proc. Amer. Acad. 
18: 179. 1883. 
Dinebra chondrosioides H. B. K. Nov. Gen. & Sp. 1: 178. pl. 53. 1816. 
Type locality, ‘‘Prope urbem Valladolid de Mechoacan.”’ 
RanGeE: Texas to Arizona and south to Oaxaca. 
HERBARIUM SPECIMENS FROM MExIco: 
Sonora: Near Cocospora Ranch, Griffiths 6790. 
Curavuanua: Chihuahua, rocky hills, Pringle 410. Santa Eulalia Plains, Wii- 
kinson in 1885. 
Duranco: Durango, dry ground, Hitchcock 7601; common on hillsides and plains, 
Palmer 546 in 1896; Griffiths 9863. 
ZacaTEcas: Plateado, Rose 2782. 
AGuascALIENTES: Aguascalientes, sterile rocky hill, Hitchcock 7467, 7476. 
Jauisco: Huejuquilla, Rose 2532. 
Micuoackn: San Antonio, Grifiths in 1909. Loma del Zapote near Morelia, 
Arséne in 1909. Morelia, Arséne in 1909. 
Puersia: Zapotlin near Tehuacén, Ross 1304. 
Oaxaca: Oaxaca, Conzatti 156; rocky hill, Hitchcock 6103, 6150; Griffiths 9742. 
25. Bouteloua eludens Griffiths, Contr. U. 8. Nat. Herb. 14: 401. pl. 78, 79, 804A, 
1912. 
Type locality, ‘‘Southern exposures upon the northern slope of the Santa Rita 
Mountains, Arizona,’’ the type specimen collected by Griffiths (no. 7269). 
