Graminaceae 67 
AAA. Lemma-awn 35—65 mm. long; annual; lower glume |-veined. 
b. Leaf-sheath scabrous; lemma-awn 3.5——4.5 cm. long. E, 
B. maximus Desf. 
bb. Leaf-sheath hairy; lemma-awn 56.2 cm. long. W. (B: gussoni.) 
B. maximus gussoni Parl. 
CHLORIDEAE (BERMuDA~-GRASS TRIBE)—Spikelets 1- to several-flowered, 
in spikes or racemes; spikes |-sided, digitately jor racemosely arranged, rarely solitary. 
Lemma usually keeled, either entire and unawned or else toothed and with |—3 straight 
awns. Grain unfurrowed, free. 
A. Spikelets 6—14 mm. long; lower glume about Vy as long as the upper including 
awn-point if present. 
B. Plants 3—18 dm. high; lemma obtuse or emarginate, not awn-pointed, | -veined, 
no sterile Jemma above the first flower. SPARTINA (p. 67) 
BB. Plants 1.5—4.5 dm. high; lemma 3-pointed, each point with a short awn, 
3—5-veined, with 1—3 sterile lemmas above the first flower. 
BOUTELOUA (p. 68) 
AA. _ Spikelets 2—4 mm. long; lower glume 2/3—I as long as the upper. 
C. Spikes all or nearly all from the tip, widely spreading when mature; rachilla 
jointed above the glumes. 
D. Perennial; spikelets 1-flowered, 2 mm. long. CYNODON (p. 67) 
DD. Annual; spikelets several-flowered, 3—4 mm. long. ELEUSINE (p. 68) 
CC. Spikes scattered along a common axis, rather closely applied to this axis; 
rachilla jointed below the glumes. BECKMANNIA (p. 68) 
SPARTINA CORD-GRASS 
Perennial, with creeping rootstocks, often maritime (not ours). Leaf-blades long, 
tough, coarse; leaf-sheath smooth. Spikelets 1-flowered, flattened, sessile, articulate 
with the pedicels, closely imbricated in 2 rows along 2 sides of a triangular rachis thus 
torming’ | -sided spikes; these spikes scattered along a common axis; rachis prolonged be- 
yond the base of the upper spikelet. Glumes keeled, acute or bristle-pointed, unequal, 
the second usually exceeding the lemma. Lemma obtuse, |-veined, thinner than the 
glumes. Palet slender, equal to or longer than the lemma, almost hyaline. Stamens 3. 
(Gk. spartine—=a cord; referring to the tough slender leaves.) 
A. 10—20 dm. high; spikelets 12—14 mm. long. E. (S. pectinata; S. cynosuroides 
for our region. ) S. michauxiana Hitch. (Slough-grass) 
AA. 3—9 dm. high; spikelets 6—9 mm. long. E. 
S. gracilis Trin. (Western Cord-grass) 
CYNODON (Capriola) BERMUDA-GRASS 
Perennial, tufted or creeping. Leaf-blades narrow, flat. Spikelets 1-flowered, ses- 
sile, in 2 rows on | side of a slender axis; spikes digitately arranged at top of stem; 
rachilla jointed above the glumes, prolonged behind the perfect flower as a slender naked 
bristle and bearing | or more rudimentary lemmas. Glumes unequal, narrow, keeled, 
acute. Lemma obtuse, slightly longer than the glumes, ]1—\3-veined; mid-vein nearly 
always prolonged into a slender awn. Palet about as long as the glume, 2-keeled. Sta- 
mens 3. Grain smooth, oblong, enclosed. (Gk. kyon=—dog, odons—a tooth; the 1- 
sided spike suggesting a row of dog-teeth.) W. E. 
C. dactylon Pers. 
