HITCHCOCK—-MEXICAN GRASSES. 239 
83. Paspalum virgatum L. Syst. Nat. ed. 10. 855. 1759. 
Type locality, Jamaica, the type specimen sent by Browne. 
RanGE: Southern Mexico and West Indies to South America. 
HERBARIUM SPECIMENS FROM MEXICO: 
Jautisco: Guadalajara, side of Barranca de Oblatos, Hitchcock 7363. 
Veracruz: Cordoba, clay cut, Hitchcock 6413; low ground along railway, Hitch- 
cock 6434; Fink 7. Jalapa, railway cut through jungle, Hitchcock 6643. Be- 
tween Coatepec and Jalapa, Hitchcock 6684, Orizaba, Bourgeau 2979, Botteri 
1267. Zacuapan, brush woods, Purpus 2906. Monte Pacho, Liebmann 173, 
Curapas: Ocuilapa, table-land, Nelson 3035. 
34. Paspalum conspersum Schrad. in Schult. Mant. 2: 174. 1817. 
Type locality, ‘‘In Brasilia.’ 
Rance: Southern Mexico to South America. 
HERBARIUM SPECIMENS FROM MEXxIco: 
Veracruz: Mirador, Liebmann 169. Jalapa, along railway in high vegetation, 
Hitchcock 6613, 6617. Orizaba, in humid grassy places, Botteri in October, 
1857. 
Cu1apas: Ocuilapa, table-land, Nelson 3047. 
35. Paspalum crassum Chase, sp. nov. 
A large coarse annual producing prop roots from the lower nodes; culms stout, erect, 
about 2 meters high, simple or sparingly branching from the lower nodes, papillose- 
hispid below the nodes and toward the summit; sheaths loose, longer than the inter- 
nodes, coarsely papillose-hispid; ligule membranaceous, about 5 mm. long, lacerate; 
blades as much as 60 cm. long and 3 cm. wide, tapering to the base, conspicuously 
papillose-hispid on both surfaces, the midnerve prominent beneath; panicle about 
20 cm. long, the axis strongly angled; racemes about 10, narrowly ascending, more or 
less arching above, the rachis about 3 mm. wide, scabrous, pilose in the axils; spike- 
lets mostly solitary (the lower of the pair undeveloped), imbricated but scarcely 
crowded, pale green, 3.1 mm. long, 1.7 mm. wide, oval, turgid, slightly concave on the 
face, blunt, glabrous, the second glume and sterile lemma subchartaceous, covering 
the fruit, the first glume minute or obsolete, firm, the sterile lemma inclosing a hyaline 
palea and a more or less developed staminate flower; fruit minutely papillose-striate, 
the margin of the lemma thin. 
Type in the U. S. National Herbarium, no. 691235, collected ‘‘in prairie, among 
high grass and weeds, 450 meters altitude, at Alzada, Colima, Mexico, September 21, 
1910,” by A. 8. Hitchcock (no. 7093). 
This striking species, known only from the type collection, is not closely related 
to any known species. Its coarse, hispid foliage and thick prop roots produce a resem- 
blance in habit to Echinochloa waltert. 
86. Paspalum tenellum Willd. Enum. Hort. Berol. 89. 1809. 
Type locality, ‘‘Hort. paris,’’ the native country unknown. 
RanGE: Highlands of southern Mexico. 
HERBARIUM SPECIMENS: 
These plants, doubtfully referred here, agree with Willdenow’s inadequate descrip- 
tion and appear to belong to the species referred to P. tenellum by Fournier’ and by 
Nash.? 
Jauisco: Zapotlan, prairie, Hitchcock 7121, 7133. San Nicolds, sterile clay hill, 
Hitchcock 7208. Guadalajara, fields, Pringle 11239. 
MicHoacdn: Maravatio, along ditch, Hitchcock 6922. 
FrepERAL District: Lava beds, Pringle 6474; clefts and depressions in lava rock, 
Hitchcock 5955; Holway 3065. 
1 Mex. Pl. 2: 11. 1886. 2N. Amer. Fl. 17: 185. 1912. 
81544°—13——_5 , 
