529 
at the apex of the culm: empty glumes membranaceous, lance-ovate, 
1-nerved, awn-pointed, the second longer than the first but shorter than 
the spikelet; floral glume involute, thicker than the outer ones, tipped 
with three awns, the middle one much longer than the glume; palet 
equaling the glume; upper florets separated on elongated smooth 
internodes of the rachilla, each awned like the lower floret.—Perennial 
grasses with flat attenuate leaves. 
* Spikelets with one sterile floret. 
1. T. fasciculata Fourn. Culms 5 to 10 dm. high, often branching belew: leaves 
narrow, thinly papillose pubescent near the base; sheaths compressed, carinate: 
spikes 8 to 15, digitate, plumose, erect, 8 to 12 em, long: spikelets 3 mm. long; 
second empty glume 3 to 5 times as long as the first; middle awn of perfect floret 
about 1 cm. long; lateral ones one-third shorter.—Mountains, western Texas to 
Arizona. 
* Spikelets with 2 or 3 sterile florets, 
2. T. pluriflora Fourn. Culms 6 to 10 dm. high, rarely branching: leaves about 
lem. wide, hispidulous or smooth; sheaths cylindrical: spikes 10 to 20, & to 20 cm, 
long, racemose or subdigitate, somewhat spreading: spikelets 4 to 5 mm. long; first 
empty glume one-half to two-thirds as long as the second; middle awn 6 to 8 mm. 
long; lateral ones less than one-third as long.—Low sandy plains, western Texas 
to New Mexico. 
44. GYMNOPOGON Beauv. 
Spikelets with one or two perfect florets and an awned rudiment, 
subsessile, remotely alternate on a slender triangular rachis: spikes 
racemose crowded, on an elongated axis: empty glumes lance-awl- 
shaped, hispid on the keel, rigid, longer than the floret; floral glume 
involute, nembranaceous, obtuse, the midnerve terminating in a single 
awn longer than the glume; palet equaling the glume: leaves flat and 
rather thick: root perennial. 
1. G. ambiguus (Michx.) Beauv. (NAKED BEARD GRaAss.) Culms 3 to6 dm. high: 
leaves numerous, flat, divaricate, 1 to 2 em. wide, 4 to 8 cm. long: spikes 15 to 40, 
spreading, 1 to2 dm. long; rachis hispid: spikelets 5 to 6 min. long, with one or two 
perfect florets and a rudiment; awn of lower floret 6 to 12 mm. long; awns of upper 
florets shorter. (Andropogon ambiquus Michx. Gymnopogon racemosus Authors. )— 
Woods and high lands, central Texas to Arkansas, 
45. SCHEDONNARDUS BSteud. 
Spikelets 1-tlowered, closely sessile in shallow excavations on alter- 
nate sides of the slender rachis: spikes remotely alternate, spreading 
or horizontal: empty glumes narrow with rigid keels; the second longer 
than the first but shorter than the rather rigid, acuminate, awnless, 
floral glume; palet slightly shorter than the glume.—Low annuals, 
branching near the base, with narrow leaves flat or twisted, 
1. S. paniculatus (Nutt.) Seribn. Culms 2 to 5 dm. high, leafy at the base: pani- 
cle naked, long and loose: spikes 5 to 15 em. long: spikelets 3 mm. long, closely ap- 
pressed jn the excavations until maturity. (Lepturus paniculatus Nutt., Schedon- 
nardus Tecanus Steud.)—Sandy plains, central Texas tu Montana. 
