POACEAE 95 
Lateral awns erect. 
Glum n 6 nun s 14. A. virgata. 
Glumes 12 mm. lon 15. A. palustris. 
Patre i Aum P or reflexed. 
Glumes 6- ong; spikelets mostly 
in pairs. 10. A. simpliciflora. 
Glumes 10 mm. long; spikelets solitary. 17. A. Mohrii. 
Central awn with no E TA bend ; all awns 
spir 
r 
First glume longer than the second: m 
n pubescent on Vitus Short (0.5 
long us. 18. A. purpurascens. 
First glume ey shorter than the second: 
fru ously sis cent on the slender 
ong) c 
Panicle slender. the Toae short, rather . 
distant, few-flowere 19. A. tenuispica. 
Panicle rather mone the branches as 
uch as 10 cm. long, rather densely 
many-flow ered. 20. A. condensata. 
1. A. tuberculosa Nutt. Stem 20-50 em. tall: panicle 10-20 cm. long: glumes 
equal, 2 em. long, awned: lemma 15 mm. long, the neck about 1 cm. long, the 
e andy soil, pinelands, 
sand-dunes, and gravelly fields, near t 
coast, Coastal Plain, New ast 
and Great Lake Lowland, Ga. to Miss., 
Minn., and Mass.—( Mez.) 
2 A. ternipes Cav. Stem ee em. tall: 
Fla. ; ; also in N. M. and Ariz.—(W. I., Mex., 
C. A., S. A.) 
3. A. dichotoma Michx. Stem slender, much branched at base, 20—60 em. 
tall: pe narrow, 5-7 em. long, 2 Ais ape short, appressed, bearing 1 or 
2 spikelets: lemma about a S long as second glum e. —Dry open grounds, road- 
sides, barrens, woods, and fields, various pio aie Fla. to Tex., Kans., and Me. 
4. A. Curtissii (A. Gr Nash. Resembles A. dichotoma: second glum 
ay) e 10- 
. long, the first shorter: lemma shorter than the second glume, the lateral ae 
12 mm 
awns just about reaching its summit: straight portion of central awn about 10 
mm. long.—Sterile open grounds, various provinces, Fla. to Okla., Wyo., and 
Md. 
A. rpg | Enge lm. a spreading, 30-60 cm. tall: panicle usually 
| a d to a ra 5-10 cm. long: aed oe on short pedicels: 
n unequal, the second poro about 2 long: lateral Logs short or 
inute.—Sterile open oe and sandy pines various provinces, La. to 
Okla., Ia., Ind., and Ten 
6. A. longespica Poir. Stem slender, 15—50 em. tall: panicle narrow and strict, 
the branches short and appressed, bearin ng 1 im 2 spikelets, the lower branches 
distant: E qn ie n m mm. ong, | nep as long as the lemma: 
central a 8-15 m Apt ral 2-6 mm. long. [A. gracilis Ell. |— 
Sterile ee ground, ae: ficlds, and dry ps various provinces, Fla. 
to Tex., Mo., and N. H. 
7. A. oligantha Miehx. Stem 30-60 em. tall: panicle few-flowered, nearly 
simple, the pedicels or branchlets short: glumes somewhat unequal, awned: 
lemma 3-nerved, 2 cm. long, narrowed into a short beak, the three awns diver- 
ò 
“tee 
