GRAMINEX. (GRASS FAMILY.) 555 
long as the middle one. — Dry pine barrens, Florida to North Carolina. July 
and Aug. — Lower palea spotted with purple. 
2, A. purpurascens, Poir Culms (1}°-2° high) slender, sparingly 
branched; sheaths smooth; glumes sometimes nearly equal, purple; lower 
palea (3" long) }-} as long as the nearly equal awns. — Dry soil, Florida, 
and northward. Aug. — Panicle slender, 1° Jong, with the branches appressed. 
* * Glumes equal, or the upper one longer. 
3. A. gracilis, Ell. Culms much branched at the base, very slender; 
leaves flat; panicle very narrow, with distant appressed branches; middle awn 
rather longer than the rough and spotted lower palea, the lateral ones much 
shorter; glumes nearly equal. — Dry gravelly soil, Florida to North Carolina. 
Aug. — Culms (with the panicle) 6’-12/ high. Spikelets purple. 
4. A. virgata, Trin. Culms (2°-3° high) branched near the base; leaves 
flat, rigid; panicles (1° long) loose; glumes nearly equal; middle awn spread- 
ing, twice as long as the erect Jateral ones, and four times the length of the short 
(2" long) lower palea. — Dry soil, Florida to North Carolina. 
Var? palustris. Every way larger (3°-5° high), with the panicle 14°- 
23? long, and the straight awns nearly iut RR aiam of queste ponds, 
West Florida. Aug. and Sept. diu 
* 5. A. stricta, Michx. Culms (29 - 89 high) tufted, ipli stiiliks leaves 
chiefly radical, filiform, involute, rigid, hairy at the base; panicle (1° long) 
spiked; lateral awns as long as the lower palea, the middle one one third 
longer. — Dry sandy ridges in the pine barrens, very common. June and July. 
6. A. dichotoma, Michx. Culms low, fork-branched; leaves filiform, 
erect ; panicle (2/—3' long) spiked ; glumes purple, longer than the palez and 
` the very short and erect lateral awns, the middle awn shorter than the pales, 
spreading. — Dry soil in the upper districts. Aug. and Sept. — Culms 6'— 12! 
high. 
7. A. spiciformis, Ell Culms simple, rigid, erect (12-13? high); 
leaves rigid, erect, convolute, smooth ; panicle spiked ; glumes much shorter 
than the long (1) very slender palez, the upper one twice as long as the 
lower; awns nearly equal, widely spreading, the middle one as long as the. 
paleæ. — Low pine barrens, Florida to South Carolina. - Aug. and Sept. — 
Panicles 2! — 4! long, at length twisted. 
8. A. oligantha, Michx. Culms (19-2? high) branched, slender ; leaves 
filiform, convolute ; spikelets scattered, single or by pairs, in a simple terminal 
raceme ; glumes nearly equal, longer than the pales ; middle awn very long 
(2'), t longer than the lateral ones, and 2-3 times the length of the 
pale. — South Carolina or Georgia, Nuttall. Sept. i 
9. A. tuberculosa, Nutt. Culms rigid, branching (1? 13? high) ; leaves 
flat; glumes nearly equal, longer than the paleze, bristle-awned ; awns (2! long) 
. equal, jointed with the paleze, twisted below, then widely spreading, several times 
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