86 POACEAE 
HI. CAPILLARIA. 
Annuals, 
Spikelets 3 mm. long or less, lanceolate or elliptic. 
Leaf-sheaths pubescent. 
Stems stout : panicle usually included at the base, its many branches 
repeatedly divided and bearing numerous spikelets. 
Stems slender: panicle exserted, its few branches but little divided 
relatively and bearing comparatively few spikelets. 
Spikelets 2 mm. long, acute. 
Spikelets lanceolate, about 0.6 mm. wide. 
Spikelets elliptic, about 0.8 mm. wide. 
Spikelets 3 mm. long, acuminate. 
Leaf-sheaths glabrous. 
First scale about 14 as long as the spikelet. 
First scale more than 15 as long as the spikelet. 
Spikelets ovate, the panicle branches ascending: leaf-blades 1.5 
dm. long or less. 
Spikelets lanceolate, the panicle branches very long and wide- 
spreading: leaf-blades 2.5-4 dm. long. 
Spikelets 5 mm. long, ovate. 
Perennials. 
Spikelets less than 4 mm. long. 
Pedicels usually not RUD four times the length of the spikelets, 
often shorter than them. 
Stems densely tufted, stiff and wiry, slender. 
Panicle branches appressed. 
Panicle branches at maturity spreading. 
Stems single or not much tufted, stout, not rigid and wiry. 
Spikelets ovate, the panicle branches ascending: leaf-blades 1.5 
dm. long or less. 
Spikelets lanceolate, the panicle branches very long and widely 
spreading : leaf-blades 2.5-4 dm. long. 
Pedicels usually many times exceeding the spikelets. 
Spikelets 5-6 mm. long, acuminate. 
IV. HALOPHILA. 
Spikelets less than 3 mm. long, obtuse or acutish. 
Panicle dense, the spikelets crowded, the first scale of the spikelet acute, 
about 12 as long as the spikelet. i 
Panicle long and narrow, loose, the spikelets rather scattered, the first 
: scale of the spikelet truncate, about 14 as long as the spikelet. 
Spikelets 5-6 mm. long, acuminate. 
V. VIRGATA, 
Stems tall, simple: panicle usually ample. 
VI. MAXIMA. 
Tall stout grasses, with large leaves and ample panicles. 
VII. AGROSTOIDEA. 
Innovations intravaginal, hence stems tufted; spikelet not oblique to the 
pedicel, the apex straight, hence equilateral. 
Fourth scale of the spikelet sessile. 
Ligule membranous. 
Panicle ovate, its branches at maturity widely spreading. 
Panicle oblong, its branches erect. 
Ligule a ring of long hairs. 
Leaf-sheaths naked at the apex: panicle branches rigid and spread- 
ing at maturity. 
Leaf-sheaths pubescent with long hairs at the apex on the outside : 
nicle branches long and slender, erect, flexuous. 
Fourth seale of the spikelet with a distinet slender a 
Innovations extravaginal, the long stolons stout and scaly: spikelet oblique 
to the pedicel, the apex decidedly curved, hence inequilateral. 
VIII. DICHOTOMA. 
A. Leaf-blades on the stem long and narrow, linear, narrowed at both ends, 
very different from the early basal ones. 
a. Leaf-blades erect. 
Stems 8-14 dm. tall, stout. 
Stems less than 6 dm. tall, not stout. 
Primary leaf-blades of the stem usually less than 4 mm. wide, from 
25-50 times as long as broad. 
Stems simple, finally with very short spikelet-bearing basal stems 
concealed in the leaves: spikelets 2 mm. long or more. 
Spikelets obtuse, the outer scales as long as or but little shorter 
than the fourth scale. 
Spikelets 2-2.5 mm. long, 
Spikelets 3 mm. long, wit 
base. 
Spikelets acute, glabrous, the outer scales manifestly exceeding 
the fourth scale. 
Stems finally branching at the nodes, no short basal stems : spike- 
lets 1.5 mm. long or less. 
Primary leaf-blades of the stem exceeding 4 mm. wide, often more 
than 1 em. in width, 20 times as long as broad or less. 
ubescent. 
a few scattered hairs near the 
29, 
105. 
dA. 
EUM 
ex 
up. 
E: 
edt 
P. 
P. 
capillare. 
Philadelphicum. 
Gattingeri. 
flexile. 
proliferum. 
Hallii. 
filipes. 
miliaceum. 
stenodes. 
diffusum. 
. Hallii. 
filipes. 
cognatum. 
capillarioides. 
. halophilum. 
repens. 
amarum. 
. virgatum. 
v 
marimum. 
agrostoides. 
condensum. 
P. Combsii. 
. P. pseudanceps. 
P. stipitatum. 
rostratum. 
P. scabriusculum. 
linearifolium. 
perlongum. 
depauperatum. 
glabrifolium. 
