POACEAE 105 
awned, sometimes minutely hairy at base; palea usually shorter than the lemma, 
small and nerveless or obsolete or rarely well-developed and 2-nerved.—One 
hundred species, natives of temperate and cool regions.—BENT-GRASSES 
Palea evident, 2-nerved. 
Bra E of panicle unequal, some short and floriferous from base: ligule 2-5 
ng. A. alba. 
Branches of panicle all naked at base: ligule about 1 mm, 
long. . A. tenuis. 
ee wanting, or minute and ne 
Lemma bearing a delicate aa n dont 5 mm. long: annual. 3. A. Elliottiana. 
Lemma with a bent, exserted awn: stems tufted. 
Spikelets 2 mm. lon ng. 
Spikelets 2.5-3 mm. lon 
Lemma awnless: panicle- Dane capillary. 
Panicle very diffuse, with very scabro primar 
branches, these branching above the middle, the 
spikelets clustered toward the ends of the smaller 
branchlets. 6. A. hiemalis. 
Panicle En but not CODD diffuse, the branches 
rking at or below the middle T. A. perennans. 
A. canina. 
. A. borealis. 
eus 
1. A. alba L. Stem s Pan em. tall, produeing short rootstocks and 
sometimes stolons: ligu long: panicle 5-30 cm. long, the lower 
branches in whorls, some floriferous from | A 
base, some naked at base: glumes acute, " V 
2-3 mm. long: lemma 24-34 as long as ‘ 
SE 
A 
"Sem nearly throughout cult. N. A. Nat. 
of Eur 
2. A. tenuis Sibth. Stem slender, sum) 
20—40 em. tall: Ma ii short pos truncate 
panicle 5- 10 em. long, open, e branches 
few and nr naked a ue [ A. vul- 
garis With.] — (Rmo IE BENT.)— 
we various provinces, Tenn. to Me. 
Nat. of Eu. 
A. Elliottiana Schult. Stem very slender, 10—40 em. tall: panicle pode 
He Sende iae e seabrous, flor ife erous toward the ends: glu 
mm. long: lem . long. [A. arachnoides Ell.]—Open dry nd 
woods, and prairies, den ERU Ga. and N. C. to Tex., Kans., and Ind. 
4. A. canina L. Stem 30-50 em. tall: panicle open, 5-10 em. long, ps 
branches Dern ee ows and waste-places, various provinces, Tenn. 
Me. Nat. of Euras 
a A. borealis Hartm. Stem 20-40 em. tall: leaves mostly basal: panicle 5-15 
m. long, ye Lr purple, the branches spreading, naked below, E 
) 
S h. [4. oo U. S.)]—Rocky places, Blue Ridge and mo 
northern ee "N. b. and Lab. 
6. A. hiemalis (Walt.) B. M P. Stem erect, slender, tufted, 20—40 em. tall, 
sometimes as much as 80 em.: leaves mo ao basal, the blades short and very 
narrow or I sotaceous: panicle often e than alf the height of the 
plant: glumes 1.5-2 long. [A. Ru "Willd d.]— S A GRASS. dup as 
E 
gr rounds, um bm N. A.—The mature panicle breaks away as a 
tumble-weed. 
7. A. perennans (Walt.) Tuckerm. Stem erect or decumbent at base, 30- 
100 em. tall, in the shade often weak and lax (more slender and taller, with 
