GRASSES OF OHIO 
277 
on the back with scarious margins or apex, 5-9-nerved; palets with 
the 2 keels near the margin; stamens 2 or 3; stigmas plumose; 
grain smooth. 
1. Spikelets linear or compressed cylindric, in. long or more. 2 
1. Spikelets ovate or oblong, in. long or less. 3 
2. Lemma acute, much shorter than the palet, about Yz in. long. P. aciitiUora. 
2. Lemma obtuse, nearly as long as the palet, about Y in. long. P. septentrionalis. 
3. Lemma very broad, obscurely nerved; panicle open; spikelets 5-12-flowered. 
P. canadensis. 
3. Lemma rather narrow, sharply and distinctly 7-nerved. 4 
4, Panicle contracted, elongated and narrow; spikelets 3-4-flowered. P. torreyana. 
4. Panicle open and lax, not elongated, its branches usually spreading or droop¬ 
ing. 5 
5. Empty glumes obtuse or rounded at the apex. 6 
5. Empty glumes truncate and denticulate at the apex; inner empty glumes nearly 
Y in. long; panicle rather narrow, with few spikelets, usually less than 6 
in. long. P. pallida. 
6. Spikelet Yz in, long or less; branches of the panicle often drooping; inner 
empty glume about ^ in. long. P. nervata. 
6. Spikelet nearly Y in. long; branches of the panicle ascending or spreading; 
inner empty glume nearly in. long. P. grandis. 
1. Panicularia acutiflora (Torr.) Ktz. Sharp-glumed Manna- 
grass. A grass 1-2 ft. high, with flattened weak and slender stems, 
and with overlapping sheaths, the uppermost inclosing the base of 
the slender panicle. Spikelets linear, 5-12-flowered, erect on the 
panicle, lemma acute, scabrous, much exceeded by the long-acuminate 
palet. 
In wet soil and shallow water. June-August. No specimens. 
2. Panicularia septentrionMis (Hlitch.) Bickn. Floating Manna- 
grass. An erect grass with somewhat flattened stems, 2-3 ft. high, 
from a creeping base and with a very slender panicle of a few re¬ 
mote branches which are at first appressed or finally horizontal. 
Spikelets 7-12-flowered, compressed-cylindric, subsessile; lemma 
hispidulous, 7-nerved, obtuse, somewhat exceeded by the acuminate 
palet. 
In shallow water. June, July. General as far south as Har¬ 
rison, Perry, Franklin and Auglaize Counties. 
3. Panicularia canadensis (Mx.) Ktz. Rattlesnake Manna- 
grass. A grass with erect simple stems, 2-3 ft. high, with com¬ 
pressed sheaths, and with very loose open panicles, the remote ca¬ 
pillary branches drooping. Spikelets 5-12-flowered, ovate, tumid; 
lemma broad, obtuse or abruptly acute, obscurely 7-nerved. 
In swamps and wet places. July, August. Ashtabula, Geauga, 
Portage, Cuyahoga, Lorain, Summit, Stark, Wayne. 
4. Panicularia torreyana fSpreng.) Merr. Long Manna-grass. 
A grass with solitary or few erect stems, 1-3 ft. high, from a run- 
