533 
Texas to southern California, Var, RApIcosA (Fourn.) Vasey has culms generally 
taller and from a strong rootstock, with leaves 3 to 4 mm. wide with slender 
attenuate points, spikes usually larger (often 3 cm. long), and spikelets exactly 
like those of the species, (Atheropogon radicosus Fourn,)—Same range as the species. 
+ + Sterile floret very smatl, 7 to 5-awned, always neutral, 
14. B. curtipendula (Michx.) Torr, (TALL MEsQuiT.) Culms 4 to 8 dm. high, 
simple or sparingly branched: leaves slender, 1 to 3 dm. long: spikes 15 to 40, 
about 1 em. long, nearly sessile, spreading or pendulous, at intervals less than their 
own length, 4 to 8-flowered: spikelets 4 to Gimm. long; second empty glume slightly 
exceeding the floret; floral glume smooth, terminating in three short, awl-pointed 
teeth; awns of rudiment usually shorter than the perfect floret. (Chloris curtipend- 
ula Michx. Bouteloua racemosa Lag.)—Dry hills and plains, Texas to New York and 
westward to Arizona. 
§ 3. Spikelets 1 to 3 in the slender numerous spikes; sterile floret reduced to 1 to 3 aUens, 
with no glumes. —TRIATHERA, 
15. B. uniflora Vasey. (MEsquit.) Culms 3 to 5 din. high, simple, rigidly erect: 
leaves narrow, subinvolute, one-half as long as the culm: spikes 25 to 75, spreading 
or pendant, secund at intervals Jess than one-half their length, bearing one spikelet 
subtended by a glume-like prolongation of the rachis: spikelets 6 to 8 mm. long; 
second empty glume twice as long as the first and slightly exceeding the floret; 
floral glume minutely 3-toothed; rudiment reduced to a single slender awn shorter 
than the floret.—Western Texas. 
16. B. aristidoides (HBK.) Thurb. (SiX-WeEKS MEsQuIT.) Culms1to3dm. high, 
spreading, branching below: leaves usually sparsely pilose near the base: spikes 5 
to 10, about 1 em. Jong, at intervals less than their length, bearing 2 to 5 appressed 
spikelets; rachis pubescent: spikelets 5 to 7mm. long; second empty glume twice as 
long as the first, equaling or slightly exceeding the floret; floral glume narrow, 
pubescent, terminating in three short awn-like teeth; pedicel of rudiment slightly 
bearded; awns 3 to 5 mm.long. (Dinebra aristidoides HBK.)—Western Texas to 
California. 
§ 4. Spikelets 3 to 6 in the cuneate spikes; second empty glume 2-cleft: rudimentary 
Jlorets 2, each 3 to 5-awned and with more or less developed glumes.—POLYODON. 
17. B. Texana Watson. (MEsquiT.) Culms 1 to3 dim, high, tufted, simple: leaves 
narrow, usually involute near the points: spikes 5 to 10, about Lem, long, secund, 
horizontal, at intervals of about one-half their length: spikelets about 6 mm. long; 
second empty glume slightly longer than the perfect floret, pubescent near the base; 
floral glume with two slender lobes and three divergent awns shorter than the body; 
palet obtuse; awns of rudiments 4 to 6 mm. long.—Dry hills throughout Texas and 
northward to Arkansas. 
47. ELEUSINE Gaertn. 
Spikelets 2 to 6-flowered, the upper floret imperfect or rudimentary, 
sessile, crowded pectinately on one side of the narrow angular or flat- 
tened rachis: spikes digitate at the summit of the culm: empty glumes 
carinate, the second slightly larger than the first, but shorter than the 
awnless florets; floral glume ovate, prominently keeled, longer than the 
palet: grain rough or wrinkled, contained in a loose pericarp.—Low 
annuals with flat leaves. 
1. E. Indica (L.) Gaertn. (Yarp-arass.) Culins erect, 5 to 10 din, high: leaves 
mostly smooth: spikes 2 to8 (rarely single), frequently one or two below the digitate 
11874—No, 3 13 
