36 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
nerved spikelets. Panicularia grandis (S. Wats.) Nash has very large 
panicles of oblong spikelets, the lemmas prominently 7-nerved. Pani- 
cularia pauciflora (Presl) Kuntze, found in the western mountains, 
has 5-nerved lemmas and rather small panicles. 
The species are sometimes called manna grass and fowl meadow 
grass. They are all excellent forage grasses, but usually form no 
very important part of the grazing because they are limited to 
swampy regions. Hydrocyanic acid has been found in Panicularia 
nervata, and some cases of cattle poisoning have been ascribed to it. 1 
5. Pleukopogon R. Br. 
Spikelets several to many flowered, linear, the rachilla disarticu- 
lating above the glumes and between the florets; glumes unequal, 
membranaceous or subhy aline, scarious at the somewhat lacerate tip, 
the first 1-nerved, the second obscurely 3-nerved; lemmas membra- 
naceous, 7-nerved, with a round indurate callus at base, the apex en- 
tire or 2-toothed, the midnerve extending into a short mucro or into 
an awn ; palea 2-keeled, the keels winged on the lower half. 
Soft annuals or perennials, with flat blades and loose racemes of 
rather large spikelets. Species three, one in the arctic region and 
two on the Pacific coast of the United States. 
Type species : Pletiropogon sabinii R. Br. 
Pleuropogon R. Br., Suppl. App. Parry's Voy. 189, pi. D. 1823. A single 
species described and figured. 
Lophochlaena Nees, in Taylor, Ann. Nat. Hist. 1: 283. 1838. Type L. cali- 
fornica, the only species described. 
Our species are found in bogs and wet meadows. One, Pleu- 
ropogon calif omicus (Nees) Benth. (fig. 9), an annual with ascending 
spikelets, is confined to California. The other, P. refr actus (Gray) 
Benth., a perennial with drooping spikelets, is found from northern 
California to Washington. They are palatable grasses, but occur too 
infrequently to be of economic value. 
6. Puccinellia Pari. 
Spikelets several-flowered, usually terete or only slightly flattened, 
the rachilla disarticulating above the glumes and between the florets ; 
glumes unequal, shorter than the first lemma, obtuse or acute, rather 
firm, often scarious at the tip, the first 1-nerved or sometimes 
3-nerved, the second 3-nerved; lemmas usually firm, rounded on the 
back, obtuse or acute, rarely acuminate, usually scarious and often 
erose at the tip, glabrous or puberulent toward the base, 5-nerved, 
the nerves parallel, obscure or indistinct, rarely rather prominent; 
palea about as long as the lemma or somewhat shorter. 
Annual, or usually perennial, low pale smooth cespitose grasses, 
with narrow or open panicles. Species about 25, mostly along coasts 
iAlsbergand Black. .Tourn. Biol. Chem. 21: 601. 1915. 
