618 CLXI. GRAMINEZ. " ATHEROPOGON. 
closely imbricate, smooth; wpper glume 5-veined ; fr. dark brown.—@) Common 
about houses, foot-paths, &c., Mid. and W. States. Aug. 
47. CYNODON. Rich. 
Gr. xvwy, a dog, odos, tooth ; alluding to the singular, one-sided spikelets. 
Spikes digitate or fasciculate ; spikelets unilateral, in a single row; 
glumes membranaceous, shorter than the flowers, persistent; 9 upper 
palea bifid-toothed ; rudiment minute, pedicellate, in a groove of the 
upper palea ; scales truncate. 
C. Dacr¥ton. Pers. (Digitaria. Ell. Panicum. Linn.) Bermuda Grass. 
Rt. creeping extensively ; st. creeping, stoloniferous at base, 1—2f long; 
lvs. hairy on the margin and towards the base, narrow-linear; sheaths hairy ; 
spikes 4—5, digitate, spreading, 2—3’ long, serrated with the uneven spikelets; 
glumes scabrous on the keel, lanceolate, acute; palee subequal, the lower 
broader, enfolding the upper.—2| A vigorous creeper, in sands and hard soils, 
Penn. to Ga. 
48. GYMNOPOGON. Palis. 
Gr. yvpvos, naked, twywv, beard ; alluding to the long awn of the palea. 
Spikes setaceous, paniculate; glumes 2, keeled, subequal, the 
lower with a straight awn from a little below the tip; rudiment aris- 
tiform. — ; . 
G. RaceMOsUM. Palis. (Anthropogon lepturoides. Nutt.) ; 
St. ascending, 18—24’ high, with short internodes; lvs. ovate-lanceolate, 
1—2’ by 4—8”, glabrous, flat, spreading, in 2 rows; sheaths hairy at the throat; 
stip. obsolete ; panicle large, pyramidal, branches simple, rigid, verticillate, 
spreading, 3—5’ long; spikelets sessile, appressed; glumes linear, pungent; 
lower palea with an awn at its back 3—4 times its length, upper bifid.—2 
Sandy fields, N. J.toGa. Aug. 
49. SPARTINA. 
Spikelets imbricated in a double row in unilateral, paniculate 
spikes; glumes 2, unequal, compressed; palez 2, subequal, com- 
pressed, awnless; style long, bifid. : 
1. S. cynosurdipes. Willd. (Limnetis. Pers. 
St. slender, smooth, 3—5f high; dvs. 2—3f long, sublinear, convolute and 
filiform at the end; sheaths striate, glabrous; panicle loose, slender, composed 
of 20 or more alternate, one-sided, pedunculate spikes 2—3!’ long; spikelets 
arranged on 2 sides of a triangular rachis; glwmes acuminate, one of them 
with a short awn; palee white and awnless.—2 Marshes, Free States and 
Can. A coarse, sedge-like grass. Aug. 
2. S. suncea. Willd. ‘saree Pers.) 
Rt. creeping extensively ; s¢. erect, rigid, round, smooth, 1—2f high; ws. 
convolute at the edges, spreading, in 2 rows; spikes 3—5; ped. smooth ; rachis 
compressed ; lower glume 3 times as long as the upper ; palee obtuse, lower one 
shorter; sty. 2.—2| Marshes and river banks, Free States and Can. Jl., Aug. 
3. S. cuaBra. Muhl. 
St. smooth, succulent, terete, 3—5f high; Jvs. concave, erect, about 2f 
long, 3’ wide at base, tapering to a long acumination; spikes 10—15, erect and 
appressed, alternate and sessile upon a triangular rachis; spikelets in a dense, 
double row.—?| Marshes, Indiana! Aug., Sept. 
50. ATHEROPOGON. Muhl. 
Gr. aSno, chaff, twywv, beard; a characteristic term. 
Spikes in a thin, simple raceme; glumes 2, membranaceous, 2- 
flowered, lower one setiform; © pales 2, lower one 3-toothed or 3- 
bristled, upper bifid ; abortive flower pedicellate, paleze 2—3-bristled. 
