



EATONIA— ELYMUS 351 



Eat6nia Rafinesque 1819 Eatonia 

 ( Named for Eaton, an American botanist) 



PI. 45, fig. 30. 



Spikelets 2-3-flowered, in narrow panicles, the axis extended beyond 

 the flower j glumes unequal, the lower linear, acute, 1-nerved, the upper 

 much broader, obtuse or rounded, 3-nerved, the edges papery; lemma lance- 

 olate, usually obtuse, palet narrow. 2-nerved; perennial. 



1. Panicle dense and spike-like, the branches 1-1.5 



in. long ; upper glume obovate, almost truncate E. obtusdta 



2. Panicle loose, the branches 1-2.5 in. long, upper 

 glume oblanceolate, obtuse to acutish E. peiuisilzdnica 



Echinochloa Beauvois 1812 Barnyard Grass 

 (Gr- echinos, hedge-hog, cliloe, grass, from the spiny spikelets) 



Spikelets 1-rlowered, in 1-sided racemes which are again grouped in 

 racemes or panicles ; glumes 2, the upper awned or awn-pointed, a sterile 

 awned lemma, the lemma and palet enclosing the perfect flower; broad-leaved 

 annual. 

 Stems 1-4 ft. high; panicle of 5-15 branches; sterile 



lemma with a long or short awn E. crus-gdlli 



Ely. mis Linne 1753 Wild Rye 



(Gr. elytnos, rolled up, from the inrolled palet) 



PI. 46, fig. 24. 



Spikelets 1-6-flowered, usually in pairs in a dense terminal spike, alter- 

 nating on the joints of the axis, the glumes forming a sort of involucre for 

 the cluster ; glumes awl-shaped, acute or awned ; lemma rounded, 5-nerved. 

 usually awned, palet 2-keeled ; perennial. 



1. Awns spreading widely; joints of the axis separ- 



ating from each other readily at maturity E. sitdnion 



2. Awns erect or ascending, or none; joints of the 



axis not separating readily at maturity 

 a. Lemma conspicuously awned 



(1) Spikelets spreading from the axis of the 



broad spike; glumes with awns 16-32 

 mm. long; awn of the lemma 2-5 cm. 

 long E. canadensis 



(2) Spikelets appressed to the axis of the nar- 



row spike; glumes 8-12 mm. long, short- 

 awned or awn-pointed ; awn of the lem- 

 ma 1-2 cm. long, or less E. sibiricus 



