210 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
HERBARIUM SPECIMENS FROM Mexico—Continued. 
Tamauuipas: Victoria, Palmer 553 in 1907. 
San Luis Potosi: San Luis Potosi, irrigated field, Hitchcock 5693. 
Tepic: Tepic, Palmer 1917 in 1892. 
Jatisco: Guadalajara, along stream, Hitchcock 7350 
Hipatao: Tula, Rose, Painter & Rose 8355. 
Couma: Alzada, along railroad, Hitchcock 7095. Paso del Rio, Emrick, 200. 
MicnoacdNn: Morelia, Arséne in 1909. 
GuanasuarTo: Irapuato, moist sandy-clay plain, Hitchcock 7394. 
Frepera District: Tacubaya, Hitchcock 5910. 
Veracruz: Veracruz, weed along street, Hitchcock 6574. Orizaba, roadside 
ditch, Hitchcock 6317, Holway 3077. 
2. Holcus trichocladus (Rupr.) Nash, N. Amer. Fl. 17: 131. 1912. 
Andropogon trichocladus Rupr.; Hack. in DC. Monogr. Phan. 6: 525. 1889. 
Type locality, ‘‘Mexico: in montosis graminosis inter la Galera et Pochutla prope 
Talca in Prov. Oajaca (Liebmann, 23, 24 in h. Havn.): loco non indicato 1. Karwinsky 
(in h. Vindob, ubia cl. Rupr. denominatus).’’ 
RanGE: Southern Mexico. 
HERBARIUM SPECIMENS: 
Teric: Tepic, Palmer 2030a in 1892. 
Oaxaca: Mina de Dolores, Liebmann 24. 
16. SORGHASTRUM Nash in Britton, Man. 71. 1901. 
KEY TO THE SPECIES. 
Plants annual. 
Spikelets pale, 4 mm. long; plants mostly less than 0.5 
meter high................000eeee eee ee eee eee eee 1. S. incompletum. 
Spikelets dark brown, 5 mm. long; plants mostly more 
than | meter high...............-.---22---------- 2. S. liebmannianum. 
Plants perennial. 
Awn poorly developed, the exserted portion usually less 
than 5 mm. long, with one bend, sometimes short 
and straight................ eee e eee eee ee eee eee ee 3. S. agrostoides. 
Awn well developed, the exserted portion 10 to 15 mm. 
long, bent twice. 
Blades, especially the lower and those of the innova- 
tions, short and straight, 3 to 10 cm. long; panicle 
loose, few-flowered, the pedicels capillary and 
recurved-flexuous.............0.--e2-- eee e eee 4. 8. nudipes. 
Blades elongated; panicle rather dense, many-flowered ; 
pedicels straight or somewhat recurved......... 5. S. nutans. 
1. Sorghastrum incompletum (Presl) Nash, N. Amer. Fl. 17: 130. 1912. 
Andropogon incompletus Presl, Rel. Haenk. 1: 342. 1830. 
Andropogon nutans incompletus Hack. in DC. Monogr. Phan. 6: 531. 1889. 
Type locality, ‘‘Mexico.”’ 
RanGeE: Southern Mexico to Costa Rica. 
HERBARIUM SPECIMENS FROM MEXICO: 
Cotma: Alzada, Orcutt 4632; Tuxpdn Canyon, Orcutt 4707. 
Jauisco: Guadalajara, hillside, Pringle 2466. Open dry ground along side of 
Barranca de Oblatos, Hitchcock 7330. Rfo Blanco, Palmer 590 in 1886. 
Micuoacdn: El Ocote, rocky hill, Langlassé 533. 
Oaxaca: Huatulco, Liebmann 34. 
