HITCHCOCK—MEXICAN GRASSES. 265 
HERBARIUM SPECIMENS FROM Mrxico—Continued. 
Oaxaca: Oaxaca, along ditch, Hitchcock 6176; rocky hill, Hitchcock 6147, 6157. 
Valley of Oaxaca, Conzatti & Gonzdlez 342. Pluma, Nelson 2482. Las Sedas, 
Smith 935. Cuicatl4n, Nelson 1652. Totontepec, Nelson 710. Tomellfn, 
along ditch, Hitchcock 6210, 6223; Rose, Painter & Rose 10063. Without 
locality, Galeotts 5883. 
Curapas: Ocuilapa, table-land, Nelson 3023a, Turubula, Nelson 3336. 
Yucatan: Izamal, Gawmer 756. 
12. Chaetochloa verticillata (L.) Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 4: 
39. 1897. 
Panicum verticillatum L. Sp. Pl. ed. 2. 82. 1762. 
Type locality, ‘‘in Europa australi & Oriente.’’ 
Rance: Temperate and warmer parts of both hemispheres. 
HERBARIUM SPECIMENS FROM MEXICO: 
CoaHuILA: Saltillo, weed in park, Hitchcock 5640. 
Jatisco: Guadalajara, Palmer 484 in 1886. 
GuANAJUATO: Irapuato, weed in yard, Hitchcock 7438. 
QUERETARO: Querétaro, weed in field, Hitchcock 5806, 5807. 
PurBia: Tehuacdn, mud of ditch, Hitchcock 6054; weed in field, Hitchcock 6064; 
cactus hill, Hitchcock 60844. 
Oaxaca: Oaxaca, weed in flower pot at hotel, Hitchcock 6118; Valley of Oaxaca, 
Pringle 4920. 
18. Chaetochloa salzmanniana nom. nov. 
Panicum sphaerocarpum Salzm.; Steud. Syn. Pl. Glum. 1: 51. 1854, not Ell. 1816. 
Type locality, ‘‘ Bahia,”’ Brazil. 
Rance: Southern Mexico to Brazil. 
HERBARIUM SPECIMEN FROM MEXICO. 
Veracruz: Cordoba, base of clay bluff, Hitchcock 6424, 
47. IXOPHORUS Schlecht. Linnaea 31: 421. 1862. 
1. Ixophorus unisetus (Presl) Schlecht. Linnaea 31: 420, 747. 1862. 
Urochloa uniseta Presl, Rel. Haenk. 1: 319. 1830. 
Ixophorus pringlei Scribn. U. 8. Dept. Agr. Div. Agrost. Bull. 4: 6. pl. 2. 1897. 
Type locality, ‘‘Mexico.”’ 
Rance: Central western Mexico to Central America. 
HERBARIUM SPECIMENS FROM MEXICO: 
Tepic: Acaponeta, moist ravine, Rose, Standley & Russell 14253. 
_ San Luis Potosi: Rascén, Purpus, 5425. 
Jauisco: Tequila, Palmer 372 in 1886. Valley of the Rio Grande de Santiago, 
Pringle 2423, 2047. 
Coutma: Jala, common weed along railway, Hitchcock 7007. Alzada, along 
railway, Hitchcock 7070, 7091. Colima, low damp place, Palmer 141 in 1897, 
1256 in 1891. 
Moretos: Cuernavaca, weed in garden, Hitchcock 6821; prostrate bunch in path, 
Hitchcock 6841. Valley of Cuantla, Pringle 8493. Trinenta, Orcutt 4407. 
GuERRERO: Iguala, common weed in cornfield, Hitchcock 6695. Balsas, weed in 
moist soil along railway, Hitchcock 6805. 
48. PENNISETUM Rich. in Pers. Syn. Pl. 1: 72. 1805. 
KEY TO THE SPECIES. 
Involucral bristles about 4 cm. long; spikes oval............... 8. P. villosum. 
Involucral bristles unequal, the longer not more than 2 cm. long; 
spikes cylindrical. 
Spikelets 5 to 9 in each involucre ..........-.------------ 7. P. multiflorum. 
