358 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Type locality, ‘‘In subfrigidis, siccis, apricis regni Mexicani inter Guanaxuati, 
Mina de Belgrado et Cubilete.”’ 
Rance: Texas to Utah and south to southern Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower Catirornta: Sierra Cantillas, Orewté in 1884. Lagoon Head, Palmer 652 
in 1889. Los Angeles Bay, Gulf of California, Palmer 500 in 1887. Calmallf, 
Orcutt in 1899. Granite hills west of Lake Maquata, Colorado Desert, Orcutt 
2029. 
Sonora: Agua Dulce, MacDougal in 1907. Guaymas, Palmer 500 in 1887. 
Paso de Luis, Mearns 2707. 
CHIHUAHUA: Santa Eulalia Plains, Wilkinson in 1885. Near Lake Santa Maria, 
Nelson 6414, Chihuahua, along dry run, Hiteheock 7777; hills and plains, 
Pringle 496. 
DuranGo: Torreén, rocky hill, Hitchcock 7547. Tlahualilo, barren hills, Pittier 
480. Cerro de San Ignacio, Purpus 4616. Durango, on the south side of 
Iron Mountain, Palmer 740 in 1896. 
CoanuIta: Saltillo, dry mesa, //itchcock 5646; dense low tufts on dry, rocky 
hills, Palmer 257 and 413 in 1898. Parras, Ross 1530; Palmer 1359 in 1880. 
Zacatecas: Cedros, foot slopes and hills, Lloyd 89. Zacatecas, along dry river 
bed, Hitchcock 7536. Concepcién del Oro, Palmer 263 in 1904, 
AGUASCALIENTES: Aguascalientes, Safford 1365. 
San Luis Porosi: San Luis Potosi, Schaffner 161; Parry & Palmer 951 in 1878. 
QUERETARO: Querétaro, rocky hill, Hitchcock 5854. Higuerillas, Rose, Painter & 
Rose 9790. San Pablo, Rose, Painter d& Rose 9819. Loma del Ciervo, 
Altamirano 1611. 
FEpDERAL District: Ross 122. 
Hipaueo: El Salto, Rose & Painter 7076, hills, Pringle 11248. 
109. ERAGROSTIS Host, Icon. Gram. Austr. 4: 14. pl. 14. f. 11. 1809. 
KEY TO THE SPECIES. 
Plants perennial. 
Panicle narrow, contracted or spike-like. 
Panicle a long slender spike, as much as 30 cm. long. 11. EF. spicata. 
Panicle contracted, more or Jess interrupted, not spike- 
like. 
Lemmas 1.5 to 2 mm. Jong; sheaths not hairy at 
the throat. .........2-2-..-.22-2-222----- 12. FE. diversiflora. 
Lemmas 3 mm. long; sheaths hairy at the throat. 13. EF. secundiflora. 
Panicle open, diffuse. 
Spikelets nearly sessile, appressed along the main 
spreading branches of the panicle............. 14. LE. sessilispica. 
Spikelets on long pedicels. 
Sheaths appressed-pilose; panicle purple, more 
than half the height of the plant. ......... 15. H. pectinacea. 
Sheaths glabrous. 
Spikelets less than 10-flowered. 
Panicle pilose in the lower axils; blades 
flat or involute toward tip only.... 19. 
Panicle glabrous in the axils or with a few 
scattered hairs only. 
Lower lemma 2mm. long; blades flat 
or involute toward tip; panicle 
narrow, the branches ascend- 
ing....-....2.--22-2-------02- 17. E. palmer. 
~ 
. lugens. 
