188 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Fruit |membranaceous, 
the palea not in- 
closed above; spike- 
lets lanceolate, sub- 
sessile in usually 
spike-like panicles.. 39. HyMENACHNE (p. 254). 
Fruit chartaceous-indu- 
rated, the palea in- 
closed (rarely the tip 
free). 
Second glume inflated- 
saccate, many- 
nerved, this and 
the sterile lemma 
much exceeding 
the stipitate fruit; 
panicle spike-like. 38. SaccioLePts (p. 254). 
Second glume not in- 
flated-saccate; pan- 
icles not spike-like. 
Culmsusually woody, 
bamboo-like; 
spikelets globose, 
large, the glumes 
and sterile lem- 
ma papery; fruit 
bony-indurated, 
a downy tuft at 
apex........... 37. Lastacis (p. 251). 
Culms not woody nor 
bamboo-like. 
Fertile lemma 
either with 
lateral append- 
ages or exca- 
vations at base, 
the margins 
usually not in- 
rolled; first 
glume large; 
blades usually 
petiolate...... 36. IcHNANTHUS (p. 250). 
Fertile lemma 
with neither 
lateral ap- 
pendages nor 
excavations at 
base, the in- 
rolled = mar- 
gins clasping 
the palea; in- 
florescence 
typically pa- 
niculate ..... 35. Panicum (p. 241). 
