Parr 2, 1912] POACEAE 167 
long; outer 
scales with a 
black spot at 
_. the apex. XII. MAcULaTA. 
Spikelets 1.8 mm. 
long or more. V. PEDUNCULATA, 
Fruiting scale smooth 
or only minutely 
roughened. 
Spikelets elliptic, 
oval, or obo- 
vate. 
Spikelets gla- 
brous, or if 
pubescent 
the hairs not 
glandular- 
tipped. 
Pubescence 
spreading, 
the spike- 
lets if gila- 
brous 2.5-3 
min. long. X. TENELLA, 
Pubescentce 
appressed, 
the spike- 
lets if gla- 
brous less 
than 2.5 
__ mm. long. XIV. CaEsPiTosa. 
Spikelets pubes- 
cent with glan- 
dular-tipped 
__ hairs. XV. LENTIGINOSA. 
Spikelets orbicular 
oe or nearly so. XVII. PANnicuLaTA. 
Fruiting scale brown. XVI. SCROBICULATA, 
Racemes numerous, crowded in a 
dense particle. 
Spikelets less than 2 mm. Jong, 
plano-convex. XVII. PANICULATA. 
Spikelets more than 2mm. long, 
or if smaller flat on both sides, XWIII. VirGaTa. 
Spikelets long-hairy, very acute. XIX. Divatrata, 
Fruiting scale acute or acutish, narrowed 
from the middle to the apex. 
Spikelets glabrous. XXVIII. LINEARIA. 
Spikelets pubescent with long hairs. 
Hairs only on the margins; stems 
finally branched. XXIX. FASCICULATA. 
Hairs on the surface; stems simple. XXX. ERIANTHA, 
Outer scales of the spikelet with the midnerve 
suppressed ; stems extensively creeping and 
trailing. XXIV. ORBICULATA. 
Stems single, with long branching or short scaly root- 
stocks, or if apparently tufted the stolons spreading 
and forming pronounced rootstocks. 
Spikelets glabrous. 
Rachis winged. 
Racemes 3-several; internodes of the rootstock 
short. XX. FLORIDANA. 
Racemes single, or sometimes 2; internodes of 
the rootstock long. XXI. MONOSTACHYA. 
Rachis wingless. XXII. BIFIDA. 
Spikelets long-hairy. XXXI. HUMBOLDTIANA. 
Racemes conjugate at the summit of the stem, occasionally 
in 3’s or with an additional one a short distance below. 
Spikelets flat on both surfaces, long-ciliate, the outer 
scales 2-nerved by the suppression of the midnerve, the 
fruiting scale thin and papery. XXV. CONJUGATA,. 
Spikelets manifestly plano-convex, not ciliate, the outer 
scales normally with a midnerve, the fruiting scale 
firm and thick. 
Fruiting scale manifestly papillose ; stems tufted. 
Spikelets closely and regularly imbricate, orbicular, 
oval, or obovate. oe . ySXVI. Notata. 
Spikelets loosely arranged, narrowly elliptic to ellip- 
tic-oblong. XXVIII. LINEARIA, 
