585 
GRAMINEJE. (GRASS FAMILY.) 
flower as long as the glumes; lateral awns as long as the palea, erect , 
the middle one over twice that length, bent horizontally (J* long). (T) 
— Sand, E. Massachusetts to New Jersey and southward. August. 
3. A. purpur&scens, Poir. Culms mostly simple (2° high), 
clothed with long smooth leaves below; panicle spiked, densely flow¬ 
ered (1° long); awns nearly equal , 3-4 times the length of the palea, 
at length spreading, the middle one rather longest (V long). 1J. (A. 
racemosa, Muhl.) — S. Massachusetts to Michigan southward. Sept. 
* * Awns united below , jointed with the apex of the palea, naked. 
4. A. tuberculosa, Nutt. Culm branched below (6' -18' 
high), tumid at the joints; panicles rather simple, rigid, loosely-flow¬ 
ered; the branches in pairs, one of them short and about 2-flowered, 
the other elongated and several-flowered; glumes bristle-awned, long¬ 
er than the palea; which is tipped with the common stalk (about its 
own length) of the 3 equal divergently-bent awns (1£' long) twisting 
together at the base, (l) — Sandy soil, Plum Island (Oakes), Con¬ 
necticut (Robbins), New Jersey, and southward. Also in Illinois. 
September. 
A. oligantha, Michx., which resembles the last, but has a more 
contracted racemed panicle, longer jointless awns, &c., is to be sought 
along our southern and western borders. 
15. SPABTINA, Schreber. Cord or Marsh Grass. 
Spikelets 1-flowered, without a rudiment, very flat, closely im- 
bricate-spiked in 2 ranks on the outer side of a triangular rachis. 
Glumes strongly compressed-keeled, acute, or bristle-pointed, 
mostly rough-bristly on the keel; the upper one larger and ex¬ 
ceeding the pointless and awnless paleae, of which the upper is 
longest. Squamulae none. Stamens 3. Styles long. — Peren¬ 
nials, with simple and rigid reed-like culms, from extensively 
creeping scaly rootstocks, racemed spikes, very smooth sheaths, 
and long and tough leaves (whence the name, from aTraprivrj, a 
cord , such as were made from the bark of the Spartium , or Broom). 
* Styles united to near the summit: spikes short-peduncled. 
1. S. cynosuroides, Willd. (Fresh-water Cord-Grass.) 
Culm rather slender (2° -4° high) ; leaves long and narrow (£' or less 
wide below), tapering to a very slender point, keeled, flat, but quick¬ 
ly involute in drying, smooth except the margins; spikes 5 -10, scat¬ 
tered, spreading ; glumes awn-pointed, especially the upper, the lower 
equalling the lower palea, whose strong rough-hispid midrib abruptly 
terminates below the membranous apex. (Trachynotia cynosuroi e>, 
Michx. Limnetis cynos., Pers.) — Banks of rivers and lakes tkroug 
