POACEAE 
II. GEMINATA 
Nodes bearded : Jeaf-sheath villous 
Aodes glabrous : plants glabrous hegi ughout. 
: glumes and sterile lemma 
per 
Spikelets not over 2.4 mm. long: glumes and sterile 
lemma not papery. 
III. FASCICULATA 
Spikelets 2-4 mm. long. 
P SECHS reticulate-veined, 2-3 mm. long: 
np scarcely reticulate-veined or arn near apex. 
Spikelets not over 2 mm. long, glabro 
Spikelets n = mm. long, R 
Spikelets 5-6 mm. 
IV. DICHOTOMIFLORA 
Leaf-sheaths papillose-hispid. 
Leaf-sheaths glabrous. 
V. "ict 
Panicles drooping: spikelets 4.5-5 m ng. 
Panicles erect: spikelets less than "3. n m long. 
Pan n oe than half the length of the entire 
Panicles 1 narrow, usually less than half as broad 
Panicles as d as 
Eunice not more than one third the entire height 
o e pla 
p pt "Jeaf-blades about 1 em. wide: spike- 
ets 
Stem slender: leaf-blades not over 6 mm. wide: 
spikelets not turgid. 
VI. MAXI 
Plant large, rather coarse, with ample panicles. 
VII. VIRGATA 
Spikelets not over 2.5 mm. long, first glume less than 
half the length of the Ld 
Panicles loosely flowered : E truncate, about 
M glume triangu- 
lar, about ER ein the length of the fal ped 
Spikelets . 3-7 mm. long (sometimes less than 3 mm. in 
P. virgatum cubense) : first glume E than half 
the length of the spikelet. 
Panicles elongate, strongly contracted: seacoast 
. high, solitary from the nodes 
tu fts. 
Panicles diffuse or only slightly contracted : plants 
sometimes of salt marshes but not littoral. 
VIII. TENERA 
Plant slender, stiffly erect, with narrow strict panicles. 
IX. AGROSTOIDEA 
Rootstock present: stem but little compressed : spikelets 
set obliquely on their appressed pedicels. 
Pan icles open: spikelets 3.4-3.8 mm. long (shorter 
in exceptional specimens). 
prr pos ue or less contracted: spikelets not over 
ng. 
Rootstock van ndn ng: stem strongly compressed: 
sheaths keeled: spikelets not obliquely disposed. 
Ligules ciliate: basal leaves half as long as the stem 
or more: panicle rather open, much exceeding 
the upper jen ct. 
Conc QC 
. P. 
RE P 
. barbinode. 
. paludivagum. 
. geminatum. 
fasciculatum. 
reptans. 
adspersum. 
texanum. 
bartowens 
e. 
dichotomiflorum. 
. miliaceum. 
flexile 
capillare. 
Gattingeri. 
philadelphicum. 
. mazimum. 
. repens. 
Gouini. 
amarum 
amarulum. 
virgatum. 
. tenerum. 
anceps. 
rhizomatum. 
63 
