348 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
HERBARIUM SPECIMENS FROM Mexico—Continued. 
Couma: Colima, in damp grassy bottoms and shady ravines, Palmer 10, 11, 167, 
and 168 in 1897; common along railway, Hitchcock 7018, 70514. 
Micnoacdn: Prairie of Tibor, Langlassé 301. . 
Veracruz: Veracruz, Miiller 2166; sandy prairie, Hitcheock 6564. Zacuapan, 
sulphur spring, Purpus 4431. Paso de Dofia Juana, Lichmann 238. Coat 
zacoalcos, Smith 1055. 
MoreELos: Cuernavaca, weed in pasture, Hitchcock 6822. 
GuERRERO: Balsas, along railway, Hitchcock 6797. Acapulco, Palmer 121 in 1894. 
Oaxaca: Cuicatlin, Nelson 165la. Oaxaca, weed, Hitchcock 6117. Tomellfn 
along ditch, Hitchcock 6233. 
Tasasco: Gonzalez River, Rovirosa 711. 
YucaTAN: Mérida, Schott 734. 
94. LEPTOCHLOA Beauv. Ess. Agrost. 71. 1812. 
KEY TO THE SPECIES. 
Plants perennial. , 
Lemmas broad, notched at apex, the lateral nerves glabrous.. 5. IL. dubia. 
Lemmas acute or awned, the lateral nerves pubescent. 
Lemmas awnless or very short-awned; plant smooth and 
glaucous........ 0.2.2.2. cee eee ee 2. DL. virgata. 
Lemmas awned, the awn as long as or longer than the body; 
sheaths and blades sparsely pilose, not glaucous... 3. I. domingensis. 
Plants annual. 
Sheaths papillose-pilose; first floret not longer than the second 
glume; spikelets minute..... ween e cee eee eee eee eee 1. L, filiformis. 
Sheaths smooth or scabrous, not pilose. 
Lemmas awned. 
Panicle large, more than 10 cm. long, the longer 
branches usually as much as 10 cm. long; 
second glume 3 mm. long; lemmas not viscid... 8. L. fascicularis. 
Panicle smaller, oval, usually less than 10 cm. long, 
the larger branches usually less than 5 cm. 
long; second glume 1.5 mm. long; lemmas 
viscid on the back.-............00200 0. cee eee 4, L. viscida. 
Lemmas awnless or mucronate only. 
Sheaths scabrous; florets closely imbricated, the 
lateral nerves of the lemmas not close to the 
MAPQiN.. 2... ee eee eee 6. L. floribunda. 
Sheaths smooth; florets loosely imbricated (not over- 
lapping more than half their length), the lateral 
nerves marginal. 
Spikelets about 4-flowered; lemmas acutish, the 
apex almost entire...............2.2...... 
Spikelets 6 to 8-flowered; lemmas erose or 
slightly 2-toothed at the broad apex, 
apiculate between the teeth............. 9. 
1. Leptochloa filiformis (Lam.) Beauv. Ess. Agrost. 71, 166. 1812, 
Festuca filiformis Lam. Tabl. Encycl. 1: 191. 1791. 
Leptochloa mucronata Kunth, Rév. Gram. 1: 91. 1833. 
Type locality, ‘‘ Amer[ica] Merid[ionalis].’’ 
RanGE: Virginia to the Pacific Coast and south to the West Indies and South America. 
HERBARIUM SPECIMENS rrom Mexico: 
Sonora: Yaqui River, Palmer 8 in 1869. Alamos, Palmer 693 and 749 in 1890. 
Llano, along railway, Hitchcock 3530, Hermosillo, meadow, Hitchcock 3585, 
~T 
. LL. aquatica. 
mS 
. imbricata, 
