48 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Second glume similar to the 
first, not broadened 
upward. 
Panicles narrow, dense 
and spikelike, 
the branches 
Panicles open, the 
branches _ spread- 
ing........---..- 
Lemmas 5 to many-nerved. 
Spikelets with 2 or more of the up- 
per glumes empty, broad and 
infolding each other.......-.. 
Spikelets with the upper glumes 
flower-bearing or narrow and 
abortive. 
Stigmas plainly arising from be- 
low the apex of the ovary. . .63. 
Stigmas placed at or near the 
apex of the ovary. 
Spikelets in 1-sided fascicles 
arranged in a glomerate or 
interrupted panicle. ..-.. 
Spikelets in panicles of ra- 
cemes. 
Glumes more or less laterally 
compressed and keeled. 
Flowers dicecious; lemmas 
coriaceous.........-. 65. 
Flowers moncecious, most 
of the flowers perfect; 
lemmas thin, scari- 
ous-margined......... 
Glumes rounded on the back, 
at least below the mid- 
dle. 
Lemmas acute, pointed or 
awned at the apex. - .67. 
Lemmas obtuse or acutish, 
usually toothed. 
Lemmas distinctly 5 to 
7-nerved; styles 
present.....-...-.- 
Lemmas obscurely 5- 
nerved; styles 
Tribe X. HORDEAE. 
Spikelets usually single at the nodes of the rachis. 
Glumes with their sides turned toward the rachis. .70. 
Glumes with their backs turned toward the rachis-.71. 
. KoEverta (p. 92). 
. Eracrostis (p. 93). 
. Meica (p. 95). 
Bromus (p. 95). 
. Dacryuts (p. 97). 
DisticuHuis (p. 98). 
. Poa (p. 98). 
Festuca (p. 101). 
. PANICULARIA (p. 103). 
. PuccINELLIA (p. 104). 
AGROPYRON (p. 104). 
Lotium (p. 106). 
