34 GRAMINEAE 



4. P. nemoralis L. Culms 20'-30' high, erect, simple and glabrous : 

 panicle slender, S'-S' long, its branches erect or ascending, V-S' long : 

 spilselets li" long, 2-4-flowered : flowering glumes cobwebby at base and 

 hairy on the mid and marginal nerves below the middle. — Sparingly 

 adventized in moist ground along the railroads at Sheffield and Courtney. 

 May-July. 



5. P. flavaL. Meadow Gkass. Culms2°-3° tall, in clumps: sheaths 

 smooth : panicle open with spreading branches, S'-IS' long : spikelets 

 2-4-flowered, 11" long, short-pedicel led : flowering glumes obscurely 

 5-nerved, the mid and marginal nerves hairy below. — In wet grounds. 

 Not common. Springy places at Burge Park . May. 



6. P. pratensis L. Kkntdcky Blue-gkass. Culms 10'-3J° tall, 

 erect, from long running rootstocks : panicle I'-S' long, usually pyram- 

 idal, its branches erect, ascending or spreading : spikelets 3-5-flowered, 

 short-pedicelled or nearly sessile, lY'-^Y' long : flowering glume 5- 

 nerved , cobwebby at base and hairy below on the keel and margin. Very 

 common in all kinds of situations throughout. April -June. 



7. P. trlvialis L. EouGH Meadow Geass. Culms l°-3° high : 

 fiheaths and leaves very rough : panicle 4'-6' long : spikelets usually 2- 

 ilowered, \\" long : flowering glumes strongly 5-nerved, only the mid- 

 nerve hairy. — Sparingly adventized at Courtney. June-August. 



8. P. sylveatris A. Gray. Wood Gkass. Culms weak, l°-3° 

 Wgh, erect : panicle i'-l' long, its branches ascending toreflexed: spike- 

 lets \."-\Y' long, 2-3-flowered : flowering glumes plainly 5-nerved, cob- 

 webby and persistent below. — Common in woods thronghout.. May- 

 June. 



9. P. ■Wolfii Scribn. Culms tufted, 2°-2J° high : panicle 3^-4' long, 

 its branches ascending, rather few-flowered : spikelets 2'''-3'''' long, 2-4- 

 flowered : flowering glumes cobwebby at base, the mid and marginal 

 nerves pubescent for three-fourths of their length. — Common in dry 

 woods in one locality on the Blue River Bluffs opposite the mouth of 

 Brush Creek. April-May. 



48. PANICULARIA Fabr. Manna Gkass. 

 Spikelets paniculate, terete or flattish, several-many-flowered. Two 

 lower glumes empty, the flowering glumes rounded, 5-9-nerved, scarious 

 at the apex. Palets 2-keeled. 



Spikelets 1"-!^'' long, oblong. 1. p. nervata. 



Spikelets 6" or more long, linear. 2. P. fluiiana. 



1. P. nervata (Willd.) Kuntze. Culms erect, 2''-3° high : panicle 

 S'-S' long, its branches at first erect, then spreading, and finally drooping : 

 spikelets 3-7-flowered, very readily breaking up at maturity. — Common 

 in wet places throughout, but especially in the northern part. May- 

 July. 



