664 ORAMIISIE^. 



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

 loose, the setaceous branches mostly by fours; spikelets 2-4-flowere(l ; 

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

 Black Mountain, Nortli Carolina (Canby). 



ERAGROSTIS, Beauv. 



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

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

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

 o-nerved, the upper one ciliate. — East Florida (Garber), Tennessee [Dr. Gat- 

 tincjer). — Probably a form of E. megcistacliya. 



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. secalimis, L. 

 — Moimtains 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. 



EliYMUS, L. 



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

 spikelets by pairs, 6-0-flowered ; glumes and palea? more or less rough-liairy, 

 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. Paleas 2, the lower one 

 awned. Statnens 3. Grain adhering to the paleas. 



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. esespitosa, 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 {Leronte in Herb. Durand). Introduced. 



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

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

 awned on the back. — Waste places. Introduced. 



