278 OHIO BIOLOGICAL SURVEY 



ning rhizome. Panicle dense, contracted, with erect branches; 

 spikelets 3-7-flowered, appressed ; lemma narrow, acute, 7-nerved. 



In wet woods. August, September. Ashtabula, Cuyahoga, Sum- 

 mit, Erie, Fairfield. 



5. Panicularia nervata (Willd.) Ktz. Nerved Manna-grass. A 



grass with erect, simple, slender stems, 1-3 ft. high, often in large 

 clumps, with an expanded nodding panicle, the capillary branches 

 drooping. Spikelets 3-7-rlowered, purplish; lemma obtuse or rounded, 

 with 7 sharp, distinct nerves. 



In wet places. June-August. General. 



6. Panicularia grandis (Wats.) Nash. Tall Manna-grass. A 

 grass with stout erect clustered stems, 3-? ft. high, and a very com- 

 pound loose and open panicle, nodding at the summit. Spikelets 

 4-7-liowered with purple flowering glumes and w r hitish empty glumes ; 

 lemma 7-nerved, obtuse or rounded at the apex. 



In wet soil and ditches. June-August. Stark, Wayne. 



7. Panicularia pallida ( Torr. ) Ktz. Pale Manna-grass. A grass 

 with pale green slender stems, 1-3 ft. high, ascending from a creeping 

 base. Panicle lax, few-flowered; spikelets 4-8-flowered, pale green; 

 lemma 7-nerved, truncate and denticulate at the apex. 



In shallow water. July, August. Trumbull County. (Ottawa 

 County — Moseley Herbarium ) 



5. Poa L. Blue-grass, Meadow-grass, Spear-grass. 



Perennial or annual grasses with flat or convolute leaves ending 

 in a cucullate tip, and with terminal panicles. Spikelets 2-6-flowered. 

 compressed; empty glumes keeled, 1-3-nerved; flowering glumes 

 longer than the empty ones, commonly with a tuft of cobwebby 

 hairs at the base, 5-nerved ; palets 2-nerved or 2-keeled, 2-toothed 

 at the apex; styles short, stigmas plumose; grain free or sometimes 

 adherent to the palet. 



1. Flowering glumes not with webby hairs at the base, naked or with short 

 hairs. :.' 



l. Flowering glumes with webby hairs at the base; stems tufted. 4 



•-'. Stem- much flattened, not tufted; rhizome long- and ereeping ; lemma ob- 

 scurely 3-nerved. l\ compressa. 



:!. Stems little or not at all flattened, tufted; lemma 5-nerved. 3 



:;. Lemma with the midnerve silky-pubescent for -)4 its length; perennials 



P. autumnaUs. 



:;. Lemma with the midnerve pilose below; annuals. P. annuo. 



i. Lemma glabrous; stems distinctly compressed; perennial. P. debilis. 



4. Lemma somewhat pubescent above the basal webby hairs; stems round or 

 only slightly compressed. 5 



5. Lateral nerves of the lemma glabrous. (> 

 .".. Lateral nerves of the lemma pubescent. 7 



6. Plant yellowish green; lemma less than ' s in. long. /'. trivialis. 

 6. IManl green; lemma more than ' * in. long. P. alsodes. 



