HITCHCOCK—MEXICAN GRASSES. 219 
HERBARIUM SPECIMENS FROM Mexico—Continued. 
Jauisco: Guadalajara, along stream, side of Barranca de Oblatos, Hitchcock 7352. 
Couma: Paso del Rio, Emrick 199. Caldras, along railway, Hitchcock 7019. 
Pursia: Tehuacdn, cactus hill, Hitchcock 6091. 
Veracruz: Cérdoba, waste places, Hitchcock 6415. Zacuapan, Purpus 3778. 
Sanborn, Orcutt 3070. 
MoreE.os: Cuernavaca, edge of orchard, Hitchcock 6858. 
Guerrero: Acapulco, Palmer 288 in 1895. 
Oaxaca: Oaxaca, along railway, Hitchcock 6119; in water of ditch, Hitchcock 
6183. Tomellin, along railway, Hitchcock 6221; Rose 3638. Tuxtepec, Nelson 
341. 
Yucatdn: Progreso, Millspaugh 1681. 
2. Valota saccharata (Buckl.) Chase, Proc. Biol. Soc. Washington 19: 188. 1906. 
Panicum saccharatum Buckl. Prel. Rep. Geol. Agr. Surv. Tex. App. 2. 1866. 
Type locality, ‘‘Middle Texas.”’ 
Rance: Southwestern United States to central Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Sonora: Guaymas, rocky lava hill, Hitchcock 3544; Palmer 348 in 1887. Nogales 
to Cocospora Ranch, Griffiths 6794. 
Curmuanva: Chihuahua, rocky hills, Pringle 378; Palmer 207 in 1885, 343 in 
1908; rocky hill, Hitchcock 7791. 
SinaLoa: Topolobampo, Palmer 243 in 1897. 
Duranco: Torreén, rocky hill, Hitchcock 7540. Tlahualilo, barren hills, Pittier 
in 1905. Durango, among loose rocks on hillside, Palmer 949 in 1896; rocky 
hill, Iron Mountain, Hitchcock 7628. 
Coanurta: Monclova, Palmer 1341 in 1880. Saltillo, rocky hill, Hitchcock 5615. 
Sabinas, Nelson 6826. 
Nuevo Leon: Monterey, edge of field, Hitchcock 5543, 5546. 
Saw Luis Potosi: San Luis Potosi, Schaffner 177; edge of field, Hitchcock 5702. 
Hipaico: Ixmiquilpan, limestone hillside, Rose, Painter & Rose 8902. 
PuEBLA: Tehuacdn, cactus hill, Hitchcock 6090. 
3. Valota hitchcockii Chase, Proc. Biol. Soc. Washington 24: 110. 1911. 
Type locality, ‘‘dry prairie soil, San Antonio, Texas,” the ‘“‘type collected June 
24, 1910, by A. 8. Hitchcock (no. 5329).”’ 
Ranae: Texas to central Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Nuevo Leon: Monterey, rocky hill among shrubs, Hitchcock 5521. 
San Luis Potosf: San Luis Potosf, along railroad cut, Hitchcock 5730. 
28. SYNTHERISMA Walt. Fl. Carol. 76. 1788. 
KEY TO THE SPECIES. 
Plants annual. 
Rachis beset with scattered, spreading long hairs. ....-- 5. S. digitata. 
Rachis with no long hairs. 
Rachis winged, triangular; pedicels angled; culms 
creeping ...-----+eeeeeeeeee creer cerr setts 6. S. sanguinalis. 
Rachis not winged; pedicels terete; culms not creep- 
ing... 222 e eee eee e eee eee e reece eect ete 7. S. filiformis. 
Plants perennial. 
Plants cespitose, not producing stolons; sheaths not 
velvety. : 
Spikelets brown-pubescent at maturity....--------- 1. S. badia. 
Spikelets white-pubescent......---------+++--2557> 2. S. lewcocoma. 
