HITCHCOCK—MEXICAN GRASSES. 259 
44, CHAETIUM Nees, Agrost. Bras. 269, 1829. 
1. Chaetium bromoides (Pres!) Benth.; Hemsl. Biol. Centr. Amer. Bot. 3: 503. 
1885. 
Berchtoldia bromoides Presl, Rel. Haenk. 1: 324. pl. 43. 1830. 
Type locality, ‘‘Mexico.’’ 
RanaGeE: Mexico and Central America. 
HERBARIUM SPECIMENS FROM MEXICO: 
Curauanua: Chihuahua, Palmer in 1886. 
Jauisco: Zapotlén, railway right of way, Hitchcock 7114. Guadalajara, prairie 
near San Pedro, Hitchcock 7287; plains, Pringle 2331; gravelly banks, Pringle 
11736. Rfo Blanco, Palmer 619 in 1886. 
Micuoacdn: Urudpan, prairie along railway, Hitchcock 6985. 
Veracruz: Orizaba, in bunches along ditch, Hitchcock 6330; Botteri; Tzuat- 
lanchillo near Orizaba, Bourgeau 2597. 
More tos: Cuernavaca, edge of orchard, Hitchcock 6856. 
45. SETARIOPSIS Scribn. in Millsp. Field Mus. Bot. 1: 288. pl. 11. 1896. 
KEY TO THE SPECIES. 
Sheaths hispid; glumes conspicuously widened. ....-.------------ 1. S. latiglumis. 
Sheaths smooth; glumes not conspicuously widened .......-------- 2. S. auriculata. 
1. Setariopsis latiglumis (Vasey) Scribn. in Millsp. Field Mus. Bot. 1: 289. pl. 71, 
1896, 
Setaria latiglumis Vasey, Bull. Torrey Club 13: 229. 1886. 
Type locality, ‘‘S. W. Chihuahua,” the type specimen ‘collected by Dr. Ed. 
Palmer in 1885.”’ 
Ranae: Pacific slope of Mexico. 
HERBARIUM SPECIMENS: 
CHIHUAHUA: Southwestern Chihuahua, Palmer 117a in 1885. 
Jauisco: Bolafios, Rose 2899. 
More os: Jojutla, limestone hills, Pringle 11246. 
GueRReERO: Iguala, mountains, Pringle 8412. Rio Balsas, Orcutt 4198. 
Cuiapas: Tuxtla, Nelson 3083. 
2. Setariopsis auriculata (Fourn.) Scribn. in Millsp. Field Mus. Bot. 1: 289. 1896, 
Setaria auriculata Fourn. Mex. Pl. 2: 43. 1886. 
Type locality, ‘‘Campeche,”’ the type specimen collected by Linden. 
RANGE: Sonora to Oaxaca and Yucatan. 
HERBARIUM SPECIMENS: 
Sonora: Alamos, Palmer 684 in 1890. 
Cummuanvua: Southwestern Chihuahua, Palmer 78 in 1885. 
Jauisco: Balafios, Rose 2899. 
Corma: Alzada, along track, Hitchcock 7092; in low wet spot, Palmer 139 in 1897. 
Moretos: Los Amates, Orcutt 4428. Yautepec, Rose, Painter & Rose 8538. 
Guerrero: Los Amates, near railway, Hitchcock 6693. 
Oaxaca: Tomellin, rocky hill, Hitchcock 6242. Cuicatlén, Nelson 1601. 
Yucatikn: Mérida, Schott 592. Izamal, Gawmer 849. 
46. CHAETOCHLOA Scribn. U. 8. Dept. Agr. Div. Agrost. Bull. 4: 38. 1897. 
KEY TO THE SPECIES. 
Bristles barbed backwards. 
Collar glabrous or nearly so; spikelets elliptical........ 12. C. verticillata. 
Collar densely hirsute; spikelets globose........---.--- 18. @. salzmanniana, 
