HITCHCOCK—MEXICAN GRASSES. 951 
87. LASIACIS (Griseb.) Hitche. Contr. U. 8. Nat. Herb. 15: 16. 1910. 
BAMBOO PANICUM. 
KEY TO THE SPECIES. 
Spikelets globose, small, 3 mm. long......................-005- 1. L. globosa. 
Spikelets oval or obovate, 3 to 5 mm. long. 
Blades conspicuously cordate-clasping; panicle diffuse, as 
much as 75 cm. long...........-2..-2- 20-22 eee eee 9. L. procerrima. 
Blades not conspicuously clasping; panicle usually not more 
than 20 cm. long. 
Plants decumbent and creeping at base, rooting at the 
nodes; fertile culms usually not more than about 
1 meter high. % 
Blades narrow, glabrous above; spikelets not clus- 
tered; stems about 0.5 meter high........ ... 2. L. grisebachit. 
Blades scabrous above; spikelets in clusters of 2 to 
4 at the ends of the panicle branches. 
Blades elongated; sheaths glabrous............. 8. L. oaxracensis. 
Blades ovate-lanceolate; sheaths pubescent.... 7. L. rhizophora. 
Plants climbing high, forming strong central canes some- 
times several meters long. 
Panicle compact; blades broad, oval to lanceolate. 4. L. compacta. 
Panicle open; blades lanceolate. 
Blades smooth or somewhat scabrous; canes, 
branches, and young shoots smooth...... 3. L. divaricata. 
Blades pubescent at least below; young shoots 
villous; branches and canes pubescent or 
rough. 
Blades velvety; floral branchlets not clus- 
tered on the strong main canes, the 
panicles large, mostly 20 to 30 cm. 
long, the blades mostly large, as much 
as 2 cm. wide and 15 cm. long...... 6. L. swartziana. 
Blades more or less pubescent but not vel- 
vety; floral branches often clustered 
or fascicled on the strong main canes, 
the panicles and blades smaller. .... 5. L. liebmanniana. 
1. Lasiacis globosa sp. nov. 
Stems woody as in L. divaricata, glabrous; sheaths glabrous, ciliate on the overlap- 
ping margin; ligule a narrow pilose membrane about 0.5 mm. long; blades firm, ellip- 
tical-lanceolate, scabrous on the margins and upper surface and more or less so be- 
neath, those of the flowering branches 1 to 2 cm. wide, 8 to 12 cm. long; panicle py- 
ramidal, loosely flowered, 6 to 15 cm. long, the branches very scabrous, widely spread- 
ing, the longer as much as 7 cm. long; spikelets on scabrous pedicels 1 to 2 cm. long, 
globose, 3 mm. long; first glume circular, gibbous, nerved, scabrous on the keel, 
ciliate on the membranous margin, about 1 mm. long; second glume and sterile lemma 
glabrous and shining, equal, a little shorter than the fertile lemma, reticulate-veined, 
lanate-ciliate on the rounded apex; fertile lemma umbonate, the point protruding 
from the second glume and sterile lemma, this and the apex of the palea woolly. 
Type in the U. 8. National Herbarium, no. 691226, collected at Acapulco, Mexico, 
by Edward Palmer (no. 114 in 1894). 
