88 POACEAE 
Spikelets less than 1 mm. long. 
Spikelets 1-2 mm. long. 
Ligule 0.5 mm. long to almost wanting. 
Blades of the primary stem-leaves, the larger 
ones, 8-15 mm. wide. 
Spikelets 1.3 mm. long: basal leaf-blades 
equalling or larger than those on the 
stem which are usually 5-7 in number. 
Spikelets 1.5 mm. long or more: basal leaf- 
blades smaller than those on the stem 
whieh usually number 4 or less. 
Upper surface of the blades very rough. 
Upper surface of the blades smooth : 
stems much-branched : sheaths in- 
flated. 
Blades of the primary stem-leaves, the larger 
ones, rarely exceeding 6 mm. wide: 
With a broad cartilaginous white much- 
thickened margin. 
Upper portion of the stem naked. the 2 
leaves below the middle. 
Stems leafy almost to the panicle: 
leaves usually 3. 
With no conspicuous white margin. 
Leaf-blades glabrous on both surfaces. 
Spikelets barely exceeding 1 mm. 
long, obovoid: primary leaf- 
blades 5-7 em. long. 
Spikelets 1.5 mm. long. elliptie: pri- 
mary leaf-blades usually less 
than 5 em. long. 
Leaf-blades pubescent, at least below. 
Stems very slender, weak: stem- 
leaves light green, thin, spread- 
ing, usually less than 2 em. long. 
Upper surface of the blades pubes- 
cent with very long weak 
hairs. 
Upper surface of the blades gla- 
brous. 
Stem stouter: stem-leaves grayish 
green, firm, 2-3 cm. long. 
Ligule of hairs 2-4 mm. long. 
Leaf-blades glabrous on the lower surface. 
Plant bright green : panicle broadly ovoid, 
its branches spreading. 
Plant grayish green, the leaves purplish: 
anicle oblong, its branches ascend- 
ing or nearly erect. 
Peet pe pubescent beneath with short 
airs. 
Stems slender, glabrous. 
Plant bright green : sheath margin cili- 
ate with long hairs. 
Plant (ue que green: sheath margin 
naked. 
Stems rather stout, the lower portion 
densely pubescent with long nearly 
erect hairs. 
2? Spikelets exceeding 2 mm. in length. 
n leaf-blades elongated, broadly linear, often 
2 dm. long and 1.5 em. wide, spreading. 
Primary leaf-blades lanceolate : 
Rounded or truncate at the base. 
Margins ciliate, at least for the lower half. 
Margins naked, or sometimes with a few hairs 
at the very base. 
Leaf-blades spreading: first scale 14 as long 
as the spikelet, acute. 
Stems puberulent: primary leaf-blades 
less than 4 em. long: plant usually 
purplish. 
Stems glabrous: primary leaf-blades 5-7 
em. long: plant usually green. 
Leaf-blades erect: first scale 44-14 as long as 
the spikelet, rounded at the apex. 
Cordate at the clasping base. 
Leaf-blades glabrous. sometimes ciliate on the 
margins. 
Stems puberulent: blades naked on the 
margin. 
Stems glabrous : blades ciliate on the margin. 
Leaf-blades pubescent. 
++ Leaf-sheaths pubescent with long hairs. 
Spikelets very prin A and sharply nerved, acute: leaf-blades 
elongated, broadly linear or linear-lanceolate, the larger 
ones often 2 dm. long and 1 em. wide. 
eo 
- 
91. 
105. 
E 
I 
TE: 
ej 
SE: 
ej 
TE 
SU 
10 
Je 
BAS 
39-5: 
biden 
4 Je 
ped be 
SED: 
p: 
E 
E- 
Wrightianum. 
erectifolium. 
sphaerocarpon. 
inflatum. 
albomarginatum. 
trifolium. 
gracilicaule. 
. flavovirens. 
Cuthbertii. 
ensifolium. 
glabrissimum., 
nitidum. 
paucipilum. 
nitidum. 
longiligulatum. 
. parvispiculum. 
equilaterale. 
Nashianum. 
. P. patentifolium. 
101. 
PD 
epilifolium. 
Webberianum. 
. Ashei. 
Sa 
commutatum. 
P. ovale. 
v 
P: 
scabriusculum. 
