982 GRAMINEJE, (GRASS FAMILY.) 
3—4), exserted, or included in the upper sheaths; awn 3-4 times the length of 
the glumes; hairs of the very slender rachis long and glossy. (A. argenteus, 
` Ell., not of DC.) — Wet or dry pine barrens, Florida to North Carolina. _ Sept. 
and Oct. — Somewhat variable, but distinguished by the dilated clustered sheaths, 
and by the silvery hairs of the spikes. 
8. A. Virginicus, L. Culms mostly tall, erect or bending, with the joints 
remote and bearded ; branches 1 - 2 from the upper dilated sheaths, compound 
and forming a long and loose panicle; spikes by pairs (rarely by fours), shorter 
than the sheaths ; awn straight, four times the length of the glumes ; sterile flower 
none. (A. vaginatus, Ell., the short branches or peduncles included in the more 
inflated sheaths. A. dissitiflorus, Michx.? A. gracilis, Carpenter, the spikes 
borne at the summit of elongated simple branches.) — Barren soil, Florida to 
Mississippi, and northward. Sept. and Oct. 
9. A. macrourus, Michx. Spikes by pairs, exceedingly numerous, crowd- 
ed in a large and close panicle ; awns 3-4 times the length of the glumes ; sterile 
flower an awn-like glume. — Varies with the whole plant glaucous and more 
slender, branches and spikes more scattered. — Low barren soils, Florida, and 
northward. Sept. — Culms 2°-5° high. 
10. A. ternarius, Michx. “Branches remote, alternate, solitary, simple, 
‘bearing mostly three distant alternate 2-cleft spikes ; hairs of the involucre shorter 
than the glume; flowers 3-androus; pale somewhat villous; awn long, con- 
torted.” Michx. In Carolina. (=) 
$2. HETEROPOGON. — Upper flower staminate or pistillate. 
11. A. melanocarpus, Ell. Culms tall (4°-8° high) panicled above; 
leaves elongated; spikes numerous, approximate, 1-sided, shorter than their 
slender filiform-pointed sheaths ; spikelets large, the two lowest pairs glume-like, 
persistent, sterile, the others deciduous ; sterile flower 3-androus, with the lower 
glume lanceolate, membranaceous, twisted, much longer than the fertile spikelet 
and the smooth and short pedicel ; fertile spikelet rusty bearded ; the coriaceous 
glumes obtuse, many times shorter than the very long (4) contorted and hairy 
€ awn.— Indian old fields, Florida and Georgia. Introduced ? — Glume of the 
sterile spikelet, like the sheaths, rugose on the back. Perhaps identical with 
A. polystachyus, Roxb, 
57. ERIANTHUS, Michx. 
"Tall reed-like grasses, with long and flat leaves, and panicled inflorescence. — 
Spikelets by pairs on the slender branches, alike, one pedicelled, the other 565- 
sile, both with a hairy involucre at the base. Lower flower of one palea, neutral ; 
_ the upper of two pales, perfect, shorter than the membranaceons nearly equal 
glumes, the lower one awned. Stamens 2-3. 
. L E. alopecuroides, Ell. Culms 49-109 high; sheaths of the broad 
: : (6" - 12") very 1 ira leaves woolly above, rough below ; panicle (19 - 2? long) 
o nding, pyramidal; hairs of the involucre copious, twice as lopg #8 — — 
