34 GKAMINEAE 



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

 panicle slender, 5 / -S / long, its branches erect or ascending, l / -3 / long : 

 spikelets H /x 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. flava L. MEADOW GRASS. Culms 2-3 tall, in clumps: sheaths 

 smooth : panicle open with spreading branches, 8 / -15 / long : spikelets 

 2-4-flowered, \\ ff 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. KENTUCKY BLUE GRASS. Culms KK-3^ 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, \\ f/ -'Z\' f long : flowering glume 5- 

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

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



7. P. trivialis L. ROUGH MEADOW GRASS. Culms l-3 high : 

 sheaths and leaves very rough : panicle 4 / -6 / long : spikelets usually 2- 

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

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



8. P. sylvestris A. Gray. WOOD GRASS. Culms weak, l-3 

 "high, erect : panicle 4 X -7 X long, its branches ascending toreflexed: spike- 

 lets \ ff -\\ f/ long, 2-3-flowered : flowering glumes plainly 5-nerved, cob- 

 webby and persistent below. Common in woods throughout. May- 

 June. 



9. P. Wolfii Scribn. Culms tufted, 2-2 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 GRASS. 

 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 \"-\\" long, oblong. 1. P. nervata. 



Spikelets 6 X/ or more long, linear. 2. P. fluitans. 



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

 5 / -8 / 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. 



