184 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
one sessile and 
perfect, the 
other pedicellate 
and _ staminate, 
neutral, or re- 
duced to a scale 
or to the pedicel 13. ANDROPOGON (p. 200). 
Inflorescence com- 
pound, panicu- 
late, the racemes 
reduced to 2 to5 
spikelets. 
Pedicellate spike- 
lets staminate 15. Hotcus (p. 209). 
Pedicellate spike- 
lets reduced to 
the pedicel... 16. SorcHasTRuUM (p. 210). 
Lemma and palea membranaceous or cartilagi- 
nous, not more delicate than the glumes. 
Lemma and palea membranaceous, resembling 
the glumes in texture. 
Spikelets paniculate, consisting of 1 perfect 
terminal floret bearing a geniculate or 
twisted awn, with a sterile floret below.. 25. ARUNDINELLA (p. 217). 
Spikelets single or in groups along a contin- 
uous axis forming a spike or raceme, or 
in the axils of the upper sheaths. 
(ZOYSEAE. ) 
Glume 1, 3 to 5-awned; spikelets clustered 
in the axils of the upper sheaths...... 23. SCHAFFNERELLA (p. 217). 
Glumes 2; spikelets solitary or in groups at 
each joint of the main axis, the groups 
falling off entire. 
Spikelets solitary; plants moncecious or 
dioecious, creeping................ 24. FouRNIERA (p. 217). 
Spikelets in groups. 
Groups of spikelets surrounded by an 
indurated false involucre formed 
by the first glumes of each spike- 
SC) 18. ANTHEPHORA (p. 213). 
Groups of spikelets not involucrate. 
Second glume coriaceous, bearing 
hooked spines on the back..... 22. Nazta (p. 216). 
Second glume not spiny. 
Groups of spikelets spreading or 
drooping, borne along one side 
of the delicate axis; lowest 
spikelet sterile, the terminal 
fertile......................- 21. AEGOPOGON (p. 215). 
Groups of spikelets erect or ap- 
pressed on both sides of the 
rather stout axis; central 
spikelet fertile, the two lateral 
staminate. 
