664 GRAMINE^E. 



P. alsodes, Gray. Culms weak (2 high) ; leaves narrow-linear ; panicle 

 loose, the setaceous branches mostly by fours; spikelets 2 - 4-floweretl ; 

 glumes and palea? acute, the lower palea hairy near the base. Summit of 

 Black Mountain, North Carolina (Canby). 



ERAGROSTIS, Beauv. 



E. Brownei, Kunth. Low (6'- 12' high), annual, tufted ; leaves linear, 

 attenuate ; panicle simple, racemose, the short branches spreading ; spikes 

 linear-lanceolate, nearly sessile, 20-30-flowered ; lower palea ovate, acutish, 

 3-nerved, the upper one ciliate. East Florida ( Garber), Tennessee ( Dr. Gut- 

 tinger). Probably a form of E. megastachya. 



BROMUS, L. 



B. racemosus, L. Panicle erect ; flowers larger, the lower palea longer 

 than the upper one, not longer than its awn ; otherwise like B. secalinus, L. 

 Mountains of Georgia, Tennessee. Introduced. 



B. Sterilis, L. Annual; culms ascending (l-2 long) ; leaves downy ; 

 panicle ample, drooping ; spikelets thin, loosely 5 - 9-flowered, the long-awned 

 flowers linear-subulate. Tennessee, and northward. Introduced. 



ELYMUS, L. 



E. Canadensis, L. Spike long (6' or more), erect or nodding, exserted ; 

 spikelets by pairs, 5-6-flowered ; glumes and paleae more or less rough-hairy, 

 long-awned. River-banks, mountains of Georgia, and northward. Culms 

 3 -4 high. Leaves broadly linear. 



HORDEUM, L. BARLEY. 



Spikelets 3 at each joint of the terminal spike, the lateral ones imperfect, 

 the middle one 1-flowered, with a rudiment at the base of the upper palea. 

 Glumes 2 before each spikelet, unequal, awned. Paleae 2, the lower one 

 awned. Stamens 3. Grain adhering to the paleae. 



H. pratense, Huds. Annual, 6'- 18' high ; upper sheath dilated ; lateral 

 spikelets short-pedicelled, awnless, the middle one long-awned. Road-sides 

 and waste ground. Introduced. 



AIRA, L. 



A. caespitosa, L. Perennial; culms tufted (2 -4 high); leaves flat, 

 linear ; panicle oblong, with erect clustered branches ; spikelets 2-flowered, 

 with a bristle-like rudiment; lower palea denticulate at the tip, as long as 

 the appressed awn. Georgia (Leconte in Herb. Durand). Introduced. 



A. caryophyllea, L. Annual, low (5' -10' high); leaves setaceous; 

 panicle widely spreading ; spikelets 2-flowered, purplish ; lower palea 2-cleft, 

 awned on the back. Waste places. Introduced. 



