Graminaceae 47 
long as its lemma, 2-veined or the veins united into 1. Stamens |—3 (1 in ours). 
Grain linear-oblong, free. (Gk. kinna—some kind of grass.) 
A. Panicle contracted, its branches erect. E. 
C. arundinacea L. 
AA. Panicle loose, its branches drooping. C. E. (C. pendula.) 
C. latifolia Griseb. (Wood Indian-reed) 
ALOPECURUS FOX-TAIL GRASS 
Annual or perennial. Stem erect or decumbent at base. Leaf-blades flat or 
rolled up; upper sheath often inflated. Spikelets flat, in a slender terminal spike-like or 
head-like panicle, jointed on the apex of the enlarged pedicel, falling from the axis 
entire. Glumes acute or obtuse, awnless or short-awned, usually united at the base, flat- 
keeled; keel ciliate or slightly winged. Lemma wide, obtuse, hyaline, 3—5-veined, 
mucronate or (in ours) with a short awn on the back, the margins united at the base. 
Palet present or none, narrow, hyaline, keeled, acute, partly included in the lemma. 
Stamens 3. Stigmas short, hairy. Grain free. (Gk. alopex—fox, oura—tail; refer- 
ring to the spike. ) 
A. Glumes united for 1/4 their length or less, long-ciliate on the keel. 
B. Inflorescence 1|—2.5 cm. long. 
C. Annual; glumes glabrous on the outer surface except for the cilia on the 
keel, 3 mm. long; awn'of lemma about 9 mm. long. U. 
A. howellii Vas. 
CC. Perennial; glumes hairy on the outer surface, 3.5—-4 mm. long; awn of 
lemma about 6 mm. long. E. 
A. occidentalis Scribn. (Mountain Fox-tail) 
BB. Inflorescence 2.5—-8 cm. long. 
D. Annual; awn of lemma 10—15 mm. long; leaf-sheath much inflated, generally 
enclosing the base of the spike. E. 
A. saccatus Vas. 
DD. Perennial; awn of lemma 8 mm. long or less; leaf-sheath moderately to 
not inflated, not enclosing base of spike at maturity. 
E. Stems erect; inflorescence 4—8 mm. in diameter. 
-F. Ligule about | mm. long; glumes acute; spikelets 4—6 mm. long. W. 
A. pratensis L. (Meadow Fox-tail) 
FF. Ligule 3—4 mm. long; glumes obtuse; spikelets 3—-4 mm. long. E. 
(A. pallescens.) A. californicus Vas. 
. EE. Stems procumbent at base; inflorescence 9—10 mm. in diameter. 
G. Awn of lemma 5—8 mm. long, arising about 1/4 from base; spikelets 4 
mm. long; lemma shorter than the glumes. U. E. 
A. geniculatus L. (Water Fox-tail) 
GG. Awn of lemma 2 mm. long, arising nearly at middle of lemma; spike- 
lets 3 mm. long;-lemma longer than glume. W.C. E. (A. geniculatus 
6 fulvus; A. geniculatus robustus.) 
A. geniculatus aristulatus Torr. 
AA. Glumes united for | /3—!y their length, smooth to hispid on the keel. W. 
A. agrestis L. (Slender Fox-tail) 
AGROSTIS BENT-GRASS 
Annual or perennial. Leaf-blades flat of setaceous. Spikelets 1—4 mm. long, 
pedicelled, grouped in a loosely spreading to spike-like panicle; rachilla jointed above 
the glumes, glabrous or nearly so, rarely prolonged beyond the flower. Glumes persistent, 
