POACEAE 
exeurrent as minute points, all the nerves pubescent ob the lateral ones 
sometimes conspicuously so throughout: palea broa 
margin, sometimes villous. [Erion euron Nash Rho Se sea ere res 
species, natives of temperate regions.—SAND-GRASSES. 
Pedicels more than 1 mm. long, often eid than the spikelet. 
Lateral nerves of the lemma excurre 
CC poe with the branches A eadine or ascending, 
na 
inc narrow, contracted or spike-like, the branches 
appresse 
Lateral nerves of the lemma disappearing at the margin, 
not excurrent: lemma about 2 mm. long. 
Pedicels less than 
- Panicle open 
Pa ail cle dense, elongate. 
1. T. flava (L.) A. Hitche. Stem 100—200 em. tall, very pal. s à along 
cm. iong, 
the upper part and in the panieles: panicle 20-45 
oe or b E (smaller, the branches stiffly ascending in T. dd Chap. 
Fla and S. C.) : spike- 
o Mex., Mo., 
TA DE ides pale, 7-8 mm. long, 5-8- 
flowered: lemmas 3-4 mm. long, minutely 
emarginate, the nerves pubescent ir ex- 
ent. [Triodia cuprea Jacq Tridens 
ite: Nash]— (TALL RED- mo. —Dry 
fields, open woods, roadsides, and waste- 
places, various provinces, Fla. to Tex., Nebr. 
and N. H. 
T. Drummondii Scribn. & me earn. Stem 
half of the nerves, all the nerves RAT as mucros.—Pinelands and 
and S. C. 
grounds, Coastal Plain, Fla. to La. 
3. T..eragrostoides Vasey & Scribn. Stems tufted, slender, 60—100 em. tall: 
panicle as much as 40 cm. long, the br dE distant, AUR Or donum. 
as mu : lem emargi nerv 
eh as 15 em. ndr ace oblon 
minutely pilose bel midnerve excurrent. [Tridens 
Nash|—Dry grounds, pm Plain, S Fla. and Tex.—(W. I., Mex 
4. T. Elliottii Bush. Stem 60-120 em. tall: panicle ae em. long, the P qiia 
ascending: spikelets along the main branches of the panicle: lemmas 4—5 
long, prominently villous on the lower n ME the nerves, emarginate, obtuse, 
all the nerves slightly exeurrent. [Trid Langloisi Nas 
Schult. Triodia ambigua Vasey ]—Low Sede Coastal Plain, Fla. to 
and S. C. 
T. stricta (Nutt.) Benth. Stem strict, | stout, 1-1. a m. tall: 
lados elongate, flat or loosely involute, 3-8 m wide: pan 
or less interrupted de narrowed abo ve, 10- 20 4 em. long: s 4— w- 
ered, about 5 mm. long.—Low moist ground and low woods, various ced 
Ala. to Tex., E and i 
84. TRIPLASIS Beauv. Slender tutted annuals or perennials, with short 
blades, short open few-flowered purple panicles, narrow eleistogamou 
in the swollen leaf-sheaths, those in the lower leaves reduced to single 1-flowered 
