912 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
17. HETEROPOGON Pers. Syn. Pl. 2: 533. 1807. 
KEY TO THE SPECIES. 
Plants perennial, 60 to 100 cm. high; outer glume of staminate 
spikelets pilose............ 2.2 e eee cece eee eee eee eee 1. H. contortus, 
Plants annual, 1.3 to 2.4 meters high; outer glume of staminate 
spikelets beset with a row of glands along the back, not 
pilose........ 2.2.22 e eee eens 2. H. melanocarpus, 
1. Heteropogon contortus (L.) Beauv.; Roem. & Schult. Syst. Veg. 2: 836. 1817. 
Andropogon contortus L. Sp. Pl. 1045. 1753, 
Type locality, ‘‘India.’’ 
Rance: Warmer parts of both hemispheres. 
HERBARIUM SPECIMENS FROM MEXIco: 
Lower Catirornia: San Pablo, rocky cliffs, Purpus 230. San José del Cabo, 
Brandegee 35. 
Sonora: Llano, prairie, Hitchcock 3524. Guaymas, Palmer 267 in 1887. Alamos, 
Rose, Standley & Russell 12713. Papago Tanks, MacDougal 52. 
Curauanua: Chihuahua, rocky hill, Hitchcock 7800; Pringle 480. Santa Eulalia 
Plains, Wilkinson in 1885. Southwestern Chihuahua, Palmer 115b. 
Duraneo: Durango, Iron Mountain, rocky hill, Hitchcock 7641; Palmer 540 in 
1896. 
Coanuita: Monclova, Palmer 1346 in 1880. 
San Luis Porosf: San Luis Potosi, Schaffner 154, 169; Parry & Palmer 9565. 
Las Candas, prairie, Hitchcock 5762. 
AGUASCALIENTES: Aguascalientes, Hartweg 249; prairie, Hitchcock 7484. 
Jauisco: Guadalajara, Palmer 767 and 767a in 1886; dry open ground, rim of 
Barranca de Oblatos, Hitchcock 7325; Rose 3428. Balafios, Rose 2938. San 
Nicolds, sterile clay hill, Hitchcock 7212. 
QuERETARO: San Juan del Rio, stony hillside, Rose, Painter & Rose 9560. 
Coutma: Alzada, prairie, Hitchcock 7058. 
MicwoacAn: Chapala, Rose 3445. Morelia, Arséne in 1909. 
VERACRUZ: Orizaba, open rocky hill, Hitchcock 6375; Bourgeau 2374. 
Puesta: ‘'chuacdn, sterile hill, Hitchcock 6092. 
MorELos: Cuernavaca, prairie, Hitchcock 6871. 
GUERRERO: Balsas, prairie, Hitchcock 6779. 
Oaxaca: Tomellin, rocky hill, Hitchcock 6193. Santa Catarina Canyon, Pringle 
& Conzattt 281. Huitzo, Conzatti 2011. Oaxaca, rocky hill, Hitchcock 6102, 
6158; Nelson 1367a, 1440. 
2. Heteropogon melanocarpus (Ell.) Benth. Journ. Linn. Soc. Bot. 14: 71. 1882 
(where it is erroneously credited to Elliott). 
Andropogon melanocarpus Ell. Bot. 8S. C. & Ga. 1: 146. 1816. 
Type locality, ‘‘in the pine barrens between Fort Barrington on the Altamaha, and 
Jefferson on the Salella, Georgia,”’ the type specimen ‘‘collected by R. Habersham.” 
Ranee: Warmer parts of both hemispheres. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower Cauirornia: San Francisquito Mountains, Brandegee 33 in 1890. 
Sonora: Fronteras, Hartman 55. 
Curmuanua: Mapula Mountains, canyons, Pringle 820. 
StnaLoa: Lodiego, Palmer 1665 in 1891. 
DuranGo: Durango, Iron Mountain, Hitchcock 7622, 7629. 
Jatisco: Guadalajara, Holway 2; dry open ground along rim of Barranca de 
Oblatos, Hitchcock 7326, 7337, 73694. Rfo Blanco, Palmer 589 in 1886. 
Balafios, Rose 2956. 
