208 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Rance: Southwestern United States and Mexico. 
HERBARIUM SPECIMENS FROM MExIco: 
Nuevo Leon: Sierra Madre near Monterey, Pringle 1971. 
Duranco: Durango, prairie along creek, Hitchcock 7613;! damp place along river, 
Palmer 469 in 1896. 
San Luis Potosi: San Luis Potosf, edge of field, Hitchcock 5681. 
Zacatecas: Zacatecas, gulch in dry hill, Hitchcock 7507; hills, Pringle 1761. 
Jauisco: Guadalajara, side of Barranca de Oblatos, Hitchcock 7360.! Rio Blanco, 
Palmer 305 in 1886.1. San Nicolas, prairie, Hitchcock 7195. Zapotlan, prairie, 
Hitchcock 7126. 
Guanasuato: Ac&mbaro, prairie, Hitchcock 6951. 
QUERETARO: Querétaro, rocky hill, Hitchcock 5842. 
MicHoacdn: Morelia, hills, Arséne in 1909. 
Hmatco: Pachuca, rocky slopes, Purpus 1631. 
MoreELos: Cuernavaca, prairie, Hitchcock 6869. 
VERACRUZ: Orizaba, Bourgeau 2374. 
27. Andropogon altus sp. nov. 
Culms in small clumps, erect or slightly decumbent at base, about 1.5 meters high, 
rather slender, the nodes bearded with stiff ascending hairs, the internodes glabrous; 
sheaths glabrous; ligules membranaceous, 3 to 4 mm. long; blades flat, scabrous, 
bearing a few long hairs on the upper surface near the base, 20 to 30 cm. long, 5 to 10 
mm. wide, narrowed into a fine point, the uppermost smaller; panicle long-exserted, 
oblong, dense, 15 to 20 cm. long, the branches appressed, naked below, these and the 
primary axis glabrous; racemes 2 to 3 cm. long, clustered on the upper part of the 
branches, the rachis joints about 4 mm. long, deeply channeled, densely long-villous 
with ascending hairs 5 to 8 mm. long; sessile spikelet 5 mm. long, villous at base, 
scabrous toward the apex, otherwise glabrous, a well-marked pinhole-like pit in the 
depression on the back somewhat above the middle; awn geniculate, about 2 cm. 
long, tightly twisted below, loosely twisted above; sterile spikelet reduced to a 
nerved awnless scale 3 to 4 mm. long, the pedicel somewhat longer than the rachis 
joint and similarly villous. 
Type in the U. 8. National Herbarium, no. 691232, collected ‘‘along irrigation ditch, 
Querétaro,’’ State of Querétaro, Mexico, July 25, 1910, by A. S. Hitchcock (no. 5868). 
Andropogon altus differs from A. perforatus in the elongated panicle and shorter 
racemes clustered toward the ends of the branches. The species has the aspect of 
Erianthus. 
RanGE: Highlands of central Mexico. 
HERBARIUM SPECIMENS: 
San Luis Porosf: Las Candas, moist grassy ground, Hitchcock 5759. 
Jatisco: Guadalajara, dry open ground along rim of Barranca de Oblatos, Hitch- 
cock 7327; side of Barranca de Oblatos, Hitchcock 7359. 
QUERETARO: Querétaro, along irrigation ditch, Hitchcock 5868. 
28. Andropogon piptatherus Hack. in Mart. Fl. Bras. 2%: 293. 1883. 
Type locality, ‘in prov. Goyaz ad Porto Imperial et Funil,”’ the type specimen 
collected by Burchell, nos. ‘8761-7 et 8780’’ cited. 
RanGeE: Mexico to Brazil. 
HERBARIUM SPECIMENS FROM MEXxIco: 
Srnatoa: Lodiego, hillside in shade, Palmer 1654 in 1891. Copradia, Brandegee 
in 1904. 
1 The blades and upper part of sheaths densely villous; referable to A. saccharoides 
subsp. leucopogon var. palmeri Hack. (in DC. Monogr. Phan. 6: 496. 1889.), Amphi- 
lophis palmerit Nash (Fl. N. Amer. 17: 126. 1912.), Palmer 305 being the type collec- 
tion. This may be worthy of subspecific or specific rank. 
