294 OHIO BIOLOGICAL SURVEY 



4. Elymus striatus Willd. Slender Wild-rye. A more or less 

 pubescent grass with simple, slender, erect stems, 2-3 ft. high, and 

 slender, dense, sometimes nodding spikes. Spikelets 1-3-flowered, 

 divergent from the rachis ; lemma hirsute, bearing a slender, rough 

 awn. Sometimes infested with ergot. 



In woods and on banks. June, July. Wayne, Erie, Auglaize. 



27. Hystrix Moench. Bottle-brush-grass. 



Usually tall perennials with simple stems, flat leaves, and loosely 

 flowered terminal spikes. Spikelets 2-several-flowered, in pairs, rarely 

 in 3's at each node of the rachis ; empty glumes vestigial ; lemmas 

 narrow, rigid, rounded on the back, 5-nerved, awned ; palet 2-keeled ; 

 grain adherent to the palet when dry. 



1. Hystrix hystrix (L.) Millsp. Bottle-brush-grass A grass 

 with simple erect stems, 2-4 ft. high, and short exserted or partially 

 included lax spikes. Spikelets usually distant, at length widely di- 

 vergent ; lemma more or less pubescent, acuminate into an awn 

 about 1 in. in length. 



In rocky woods. June, July. General. 



28. Hordeum (Tourn.) L. Barley. 



Tufted annual or perennial grasses with terminal spikes, which 

 disarticulate at maturity. Spikelets with one perfect flower, rarely 

 2-flowered, usually in 3's at each joint of the rachis, the middle one 

 sessile and perfect, the lateral ones pediceled and usually reduced ; 

 empty glumes equal, rigid, narrow or setaceous ; lemma obscurely 

 5-nerved, awned ; palet slightly shorter, the two keels near the 

 margin ; grain usually adherent to the palet at maturity. 



1. With 3 fertile spikelets at each joint of the rachis; lemma with an awn 4-6 

 in. long. H. vulgare. 



1. With 1 fertile and 2 lateral, more or less vestigial spikelets at each joint of 

 the rachis. 2 



2. Spike Hat ; awn of the lemma enclosing the fertile flower 4-6 in. long. 



H. distichum. 

 2. Spike not decidedly flattened, awn ?> in. or much less in length. 3 

 '■'>. Awns Vi in. or less in length. H. nodosum. 



:!. Awns 1-:: in. long, the whole spike appearing like a brush. H. jubatum. 



1. Hordeum vulgare L. Common Barley. An annual grass 

 with simple erect hollow stems, 1-3 ft. high, and dense terminal 

 spikes. Spikelets 3 at a joint of the rachis each with a perfect flower; 

 lemma usually with a coarse long awn which breaks readily. Cul- 

 tivated for its grain. 



In fields and waste places, especially along railways. June, 

 July. Franklin, Tuscarawas, Portage. Escaped from cultivation. 



