116 POACEAE 
tinuous rachis, the rachilla prolonged behind the 1 or more fertile florets bear- 
ing a rudiment of a floret, this sometimes bearing 1 or 2 slender awns; glumes 
narrow, acuminate, l-nerved, usually longer than the floret; lemmas narrow, 3- 
nerved, the ioral nerves near the margin, the apex mace bifid, bearing 
between the teeth a slender awn, or rarely awnless.—Ten species, mostly Ameri- 
ean.—BEARD-GRASSES. 
Awn longer than the lemma: spikes floriferous from base. 1l. G. ambiguus. 
Awn shorter than the lemma or none. 
Spikes spreading or reflexed, naked for 1 to several cm. at 
base: leaf-blades spreading : spikelets 2-flowered. 2. G. brevifolius. 
Spikes ascending, approximate, floriferous from Bases leaf. 
blades ascending: spikelets 3-flowered (2-4-flower red), 
the florets zigzag. 3. G. Chapmanianus. 
: eo ambiguus (Miehx.) B. S. P. Stem 30-60 em. P Poi ra a 5-10 
n "ndi yu em. Ea glumes 4-6 mm. long: . long 
i ds, 
1G. cemo 
pela n hillsides, "Coastal Plain and N d— n 
adj. provinces, Fla. t Kans., and UP 
N. J. 
. G. brevifolius Trin. Resembles G. am- 
bigwus: stem more slender: leaf-blades nar- 
rower and shorter: spikes floriferous usually 
only the upper half or third.—Dry 
Meng Coastal Plain, Fla. to La. and 
N. J. 
G. Chapmanianus A. Hitehe. Stem 30- 
relatively stout. — Sandy inge F 
Nb BOUTELOUA Lag. Low or rather tall bind Or €— with 
any spikes, or sometimes solitary, racemose on commo the 
dus few to many in each spike, pectinate or more ee ar- 
ranged and appressed, the rachis of the spike eee cone beyond the in- 
sertion of the spikelets. Spikelets 1-flowered, with the rudiments of 1 or more 
florets above, sessile in 2 rows along one side of the Mis. dn unequal, 1- 
nerved, acuminate or short-awned, the first shorter and narrower: lemma as long 
or often rather long awns, the internerves usually extending into teeth; palea 
sometimes 2-awned; rudiment various, usually 3-awned, a second rudimentary 
floret sometimes present. [Triathera Desv. Atheropoyon a olyodon 
B. K. c ou species, mostly North American.—MESQUITE-GRASSES. 
GRAMA- GRASSES 
Buke m zx M us entire: spikelets not pectinately ar- 
nge 1. B. curtipendula. 
Spikes persistent "thé "Hor ts falling, more than twice as long as 
spikelets pectinately arranged.—BOUTELOUA 2. B. hirsuta. 
1. B. curtipendula (Michx.) Torr. Stem erect, 50-80 cm. tall: inflorescence 
15-25 em. long, mostly 1-sided: spikes 1-2 cm. long, the peduncles recurved: 
