POACEAE 
Spikelets and leaf-blades not as above, the former obtuse. 
Spikelets glabrous, or with a few scattered hairs. 
Spikelets 3 mm. long. 
Leaf-sheaths, at least the lower ones and those on the 
branches, densely papillose-hispid. 
Lower leaf-sheaths with scattered papillae from some of 
: which arise hairs. 
Spikelets not exceeding 1.5 mm. long. 
Leaf-blades pubescent with long weak hairs. 
Leaf-blades glabrous, or if pubescent the hairs few and 
: very short. 
Spikelets densely pubescent. 
Leaf-blades glabrous on both surfaces, or the lower surface 
sometimes with a few scattered long hairs. 
Spikelets 2 mm. long or less. 
Leaf-blades oblong-lanceolate, broadest at the mid- 
dle: spikelets about 1.5 mm. long. 
Leaf-blades broadest below the middle, long-acumi- 
nate : spikelets a little less than 2 mm. long. 
Spikelets about 3 mm. long : 
Broadly obovoid, turgid. 
Elliptic, not turgid. 
Leaf-blades pubescent on one or both surfaces. 
Spikelets but little exceeding 1.5 mm. long or less. 
Lower surface of the leaf-blades softly pubescent with 
usually short hairs,sometimes intermixed with a 
few stiff ones. 
Spikelets about 1 mm. long. 
Spikelets about 1.5 mm. long. 
Upper surface of the leaf-blades glabrous or 
nearly so, or at first with a few scattered 
hairs. 
Leaf-blades See, ciliate on the 
margin with long hairs. 
Leaf-blades naked on the margin, or some- 
times with a few scattered hairs. 
Upper surface of the leaf-blades strongly pubes- 
cent, sometimes with long stiff hairs. 
Stems low, slender, usually 2 dm. tall or less. 
Stems tall, stout, 4 dm. high or more. 
Spikelets obovoid, 1.5 mm. long: pubes- 
cence on the lower surface of the leaf- 
blades short. 
Spikelets elliptic, about 1.75 mm. long: 
pubescence on the lower surface of 
the leaf-blades longer and villous. 
Lower surface of the leaf-blades as well as the upper 
surface pubescent with long usually stiff hairs. 
Spikelets 2 mm. long or more. 
Pubescence on the lower surface of the leaf-blades of 
long stiff spreading hairs. 
Pubescence on the leaf-sheaths and stems appressed 
or ascending. 
Pubescence on the sheaths and stems widely 
keystore A à 
Spikelets about 2 mm. long, obovoid. 
Hairs on the upper surface of the leaf-blades 
similar to those on the lower surface. 
Hairs on the upper surface of the leaf-blades 
mueh longer than those of the lower 
surface. 
Spikelets 2.5-2.75 mm. long, elliptic. 
Spikelets purplish. 
Spikelets yellow. 
Pubescence on the lower surface of the leaf-blades of 
either soft and short or appressed hairs. 
Upper surface of the leaf-blades glabrous, or at 
least the pubescence much more scanty than 
on the lower surface. 
Stems pubescent below with long stiff appressed 
or nearly appressed hairs. 
Leaf-blades naked on the margins : 
Exceeding 1 em. in width : spikelets about 
4 mm. long. 
Less than 1 em. in width: spikelets 3 mm. 
long or less. 
Spikelets 2-2.5 mm. long. 
Spikelets 3 mm. long. à 
Leaf-blades ciliate on the margin with Jong 
hairs. 
Stems villous below. ; 
Both surfaces of the leaf-blades pubescent with 
short hairs. 
Stems glabrous or nearly so. 
Stems strongly pubescent. 
Pubescence minutely villous, or of long and 
stiff ascending or appressed hairs. 
104. 
61. 
5d 2d 
79; 
95. 
97. 
119. 
mp: 
D: 
PE 
. Helleri. 
V 
72 
I 
I 
Y 
P. 
ID. 
DP. 
p 
P: 
D. 
P. 
F.: 
E: 
D. 
js 
89 
Scribnerianum. 
Earlei. 
curtifolium. 
Lindheimeri. 
arenicola. 
. Seribnerianum. 
. Helleri. 
leucothrix. 
cilioswum. 
Tennesscense, 
filiculime. 
lanuginosum. 
Thurowii. 
. unciphyllum. 
chrysopsidifolium. 
pseudopubescens. 
Atlanticum. 
villosissimum. 
zanthospermum. 
Ravenelii. 
Commonsianum. 
strictifolium. 
ciliiferum. 
oligosanthes. 
annulum. 
