GENERA OR FAMILIES. 181 



emargmate, that of the male floret with a twisted awn at 

 the base, that of the hermaphrodite floret with a small 

 straight awn under the apex ; stamens three ; styles two. 



(319) Holcus panicle somewhat open; lower floret hermaphro- 



dite, the upper male ; glumes two, nearly equal, boat- 

 shaped ; pales two, the outer of the male florets awned 

 under the apex, of the hermaphrodite floret awnless ; sta- 

 mens three ; styles two. 



ttt Spikelets one-flowered, sessile along one side of the simple 

 linear brandies of the panicle (Chlorideae). 



(320) Spartina panicle of 2-4 erect, spike-like branches ; 



spikelets in two rows, pressed close to the rachis ; glumes 

 two, unequal ; pales two, nearly equal, both keeled ; 

 stamens three ; styles two. 



tttt Spikelets one- or several-floivered, sessile in the notches 

 of a simple spike (Hordeinea3). 



$ Spikelets one-flowered, 



(321) Leptums spike slender, cylindrical; glumes two, hard, 



ribbed ; pales two, thin, awnless, about as long as the 

 glumes ; stamens three ; styles two. 



(322) ETardus spike slender, simple, one-sided ; glumes none ; 



pales two, the outer wrapping up the inner, which is flat ; 

 stamens three ; style one. 



(323) Hordeum spikes cylindrical, dense ; spikelets in threes, 



1-3 usually neuter or barren ; fertile ones with one per- 

 fect floret and a rudimentary neuter one ; glumes two, 

 collateral, awned ; pales two ; stamens three ; styles two. 



JJ Spikelets several-flowered. 



(324) Elymus spike cylindrical, rather dense ; spikelets in 



pairs, each containing 2-4 florets ; glumes two, colla- 

 teral, awnless ; pales two, less pointed than the glumes \ 

 stamens three ; styles two. 



