44 POACEAE 
on rachis and E pedicels not 
Ene spikele 19. A. Cabanisii. 
First glume of Sas spikelet 
nerve ae ess between the keels. 
Awn twisted into a column at 
base ) 
Stamen 1: spikelets 4-5 mm. 
long, with mo hairs 
about as long, con- 
cealing the US. awn 
rather short. 20. A. arctatus. 
Stamens 3: spikelets 5-7 
r 
longer,  concealing the 
spikelets : awn 15-20 mm. 
; 21. A. ternarius. 
Awn not twisted into a column 
at base: plant stout, much- 
branched: spikelets 3 mm 
long. 22. A. floridanus. 
A. tener (Nees) Kunth. Stem slender, 0.6-1 m . tall, sometimes reclining 
deoram leaf- blades seareely 1 mm. wide: racemes long- -exserted, slender, 
: first glu 4 
awn 
mm. lon [S. tenerum , Nees —Drv pine- 
m woods, an nd prairies, Coastal Plain, 
a. and Tex.— (IF. I., Mex., A., 
2. A. dete dr pls p Stem 
glabrous, ereet, ae d eaf- pesa 
RE 2—4 vide acemes 
i pm mt the joi m: 
m. tiapid at ee bs erect hairs: sessile 
spikelet about 6 long, acuminate, the 
awn a -15 mm. 
7 =a _ Tong sterile pedicel ciliate 
on belo he middle 
[ S. ie eee pen. Fla.— (I. I., S. A.) 
. A. maritimus Chapm. Stem decumbent at pene often p 0.4—0.6 m 
lon ng: leaf-she nd compressed and keeled: racemes 3-0 e ong, the rachis 
ered r Ears bee mg flexuous, the hairs about 5 um ee sessile spikelet 
8 ong, KR ous, the awn about 1 cm. long: sterile spikelet staminate, 
e. as pes as ae fertile. [S. maritimum Nash ]- Coastal sands, W Fla. 
and Mis 
4. A. littoralis Nash. Resembling A. maritimus: sterile. o a single 
glum t 5 mm. long, the 3 nerves b utum. into eusps or awns, the central 
distinet, the lateral usually minute, etimes wanting. rs. littorale Bickn. 
S. triaristatum Nash ]—Sand-dunes ana poe Coastal Plain, Fla. to Tex., 
. Y., and N. J. 
A. stolonifer d A. wong Stem 0.6—1 m. tall, often glaucous: hae 
sheaths glabrous: racemes 3—4 em. long, the rachis slender and flexuous, the 
s t 3 mm. long: aisle spikelet eripi 3 mm. long. [S. s Bose ium 
ash]—Pinelands, prairies, hammocks, and rublands, Coastal Plain, Fla., 
—Differs from A. scoparius in hae rootstocks. Forms rarely have 
Ga. 
pA leaf- sheaths. 
6. A. scoparius Michx. Stem 0.5-1.5 m. tall, n KA leaf-sheaths 
glabrous or sometimes villous: racemes 3-6 cm. long, rachis slender an 
uous: sessile spikelet 6—7 mm. long, A, A a 8-15 mm. long. 
d S Nash S. villosissimum Nash S. acuminatum Nash]— (LITTLE 
STEM. BROOM-SEDGE.)—Pinelands, prairies, open woods, hillsides, and dry 
fields, various provinces, Fla. to Ariz., Alb., and N. B. 
