525 
erect; branches mostly single, erect, naked at the base, 1 dim. long or less: spikelets 
2.5 to 3mm. long; empty glumes thin, obtuse, subequal, nearly as long as the floret; 
floral glume and palet slightly pubescent near the base or nearly smooth; awn 5 to 
10 mm, long or absent, often varying much in the same panicle. (Podoswmum 
distichophyllum Presl. Awnless form is Epicampes ligulata Scribn,)—Rocky ridges, 
western Texas to Arizona. 
34. EPICAMPES P’resl. 
Spikelets 1-flowered, terete or turgid, in a dense long narrow pan- 
icle: outer glumes subequal, acute, equaling or shorter than the floret; 
floral glume and palet nearly equal, similar in texture, raised on avery 
short stipe.—Tall reed-like perennials. 
1. BE. rigens Benth. Culms erect, about 1 m. high: leaves narrow, convolute, 
rigid, rough; ligule 3 to 6 min, long: panicle very narrow, 3 to 6 dm. long; rays ver- 
ticillate, appressed, unequal, the longer 8 to 8 em. long, naked near the base: 
spikelets 3 to 4 mm, long; empty glumes thin; floral glume pubescent near the 
base.—High plains, western Texas to California. 
35. AGROSTIS L. (Bent Grass.) 
Spikelets 1-flowered. small, in a spreading or contracted verticil- 
lately-branched panicle: empty glumes persistent, subequal, acute, 
longer than the smooth oblong floret; floral glume thin, hyaline, obtuse, 
5-nerved, smooth, awnless or with a short dorsal awn; palet often 
wanting; hairy callus small, obseure.—Culms tufted, slender. 
* Panicle loose, with spreading capillary branches: palet wanting. 
1. A. Blliottiana Sclultes. (SPIDER BENT GRASS.) Culms 2to5dm. high, weak: 
leaves 1 to 2 mm. wide, 3 to 5 em. long: panicle one-half as long as the culm; 
branches naked below the middle: spikelets 1.5 to 2 mm, long; empty glumes equal, 
one-fourth longer than the floret; floral glume 2-toothed, with a very fine awn 2 to 
4mm. long from near the apex or awnless. (Agrostis arachnoides Ell. non Poir.)— 
Low wet land, central Texas to Tennessee. 
2. A. perennans (Walt.) Tuck. (THIN GRASS.) Culms 3 to 6 dm. high, erect or 
decumbent below: leavesabout 3mm. wide, 1 to 2 dm. long, seabrid: panicle oblong, 
1 to3 dm. long; branches divided to the middle or below: spikelets 2 to 2.5mm. long; 
empty glumes subequal, one-fourth longer than the floret; floral glume awnless. 
(Cornucopia perennans Walt. )—Rare in northern Texas, common northward, 
3’ A. scabra Willd. (Harr Grass.) Culms 3 to 6dm. high, erect: leaves about 2 
mm. wide, 1 dm, long or less, seabrid, often involute ; panicle 2 to 3 dm. long, broadly 
spreading; branches subdivided near the extremities, very scabrid: spikelets about 
2? inm. long; empty glumes narrowly acute, slightly unequal, one-third longer than 
the floret; floral glume awnless or rarely with a short, dorsal awn.—Rare in north- 
ern Texas, common northward, 
** Panicle contracted, dense: palet equaling the floral glume, 
4. A. verticillata Vill. Culms 2to5 dm. high from a decumbent base: leaves 4 to 
Smm. wide, 5 to 15 em. long: panicle 5 to 10 em. long, interrupted below; branches 
densely flowered to the base: spikelets about 2 mm. long; empty glumes equal, 
minutely pubescent throughout.—Common, western Texas to Colorado and Cali- 
fornia. 
