POACEAE 
acute or acuminate, glabrous spikelet: 
DIS annua 
First glume not truncate (except in P. repens). 
lant annual. 
Spikelets glabrous, pointed: leaf-sheaths 
papillose-hispid ; leaves a 
Spikelets To leaves glabro 
Plant perenn 
SDR short-pediceled along one side of 
the n branches of the panicle form- 
ing Bde" or spike-like racemes, some- 
times somewhat aggregate toward the 
ends of branches (see also VIII. Tenera). 
First glume nearly equalling the sterile 
emma. 
First n much shorter than the sterile 
Panicle dong (15-30 cm.), very narrow, 
the branches erect or nearly so; fruit 
rather thin and soft, the palea scarcely 
enclosed. 
Ean usually open (at least not long 
nd narrow), the main branches 
a fruit indurate, the palea 
enclosed : plants commonly produc- 
ing axillary panicles. 
re E nd not enlarged at ma- 
Sterile "palea enlarged at maturity, 
for open the spikelet. 
RDIR TELS in A or sometimes in contracted 
ongested panicles, but the main 
beaches not in narrow or spike-like 
Panicle narrow and few-flowered: stem 
dur E wiry: leaf- blades drying Tad 
Panicle ‘open or contracted, several- to 
-flowered: stems stout or rigid. 
Basal ee usually EE different from those of 
Hs em, form a wint aa stems at first 
lar anicle no 
t all 
a. fruitful ookee: panicles open, 
the branchlets usually flexuous : perennials. 
pd EAE ong not more than 5 mm. wide, 20 
ng a m. autumnal phase branch- 
ee yes ae jo 
Leaf-blades not elongate Ge if so more than 5 mm. 
wi 7 ied autumnal phase not branching from 
ase 
Plant branehing from the base, finally forming 
rosettes or cushions, the foliage soft and lax: 
leaf-blades prominently ciliate (except in P. 
laxiflorum 
Plant branching. ien the stem-nodes or rarely 
remaining sim 
Leaf-blades LA "i: autumnal phase bushy- 
branche 
Spikelets turgid. attenuate at base, mostly 
pustulose-pubescent : leaf-blades conspicu- 
a 
phase usually not bushy-branche 
Spikelets ae blunt, strongly nerved (not 
strongly turgid in P. oligosanthes) : leaf- 
blades Pd as "much as 1.5 cm. wide 
meti m. i 
(so 
Lenfsheaths glabrous or minutely Pau 
lent: spikelets 1.5-2.5 m long, a 
metrically RUSO strongly edt 
stems wiry 
et 
V. 
XXIX. 
XXVIII. 
t 
X. 
VIII. 
XIII. 
XIV. 
XV. 
XXIII. 
61 
DICHOTOMIFLORA. 
CAPILLARIA. 
. VERRUCOSA 
GYMNOCARPA. 
HEMITOMA. 
AGROSTOIDEA. 
. LAXA. 
TENERA. 
VIRGATA. 
. DEPAUPERATA. 
LAXIFLORA. 
ANGUSTIFOLIA. 
BICKNELLIANA 
TANCEABIA. 
