92 BRITISH GRASSES. 



awns short ; styles bristle-shaped, spreading ; stigmas 

 downy ; filaments long, hair-like ; anthers oblong, forked 

 at each end; seed ovate. Species 5: — 1. ccespitosa ; 

 2. flexuosa ; 3. canescens ; 4. prcecox ; 5. carophyllea. 



Genus 18. Avena. Spikelets many-flowered, loosely 

 collecting the florets; outer glumes lanceolate, acute, 

 ventricose, loose, awnless ; flowering-glumes slightly 

 smaller, two-cleft at the top, awned ; scales two ; ovary 

 blunt; styles two, reflex, hairy; stigmas simple; fila- 

 ments thin, capillary ; seed oblong, slender, pointed, 

 marked with a longitudinal furrow, clothed with the 

 flowering glume and palea. Species 3 : — 1. fatua ; 

 2. pratensis ; 3. flavescens. 



Genus 19. Arrhenatherum. Spikelets several- 

 flowered, the lower floret in each spikelet male ; the 

 lowest flowering glume awned. Species 1 : — avenaceum. 



Genus 20. Holcus. Spikelets two-flowered, one 

 floret male, the other perfect ; outer glumes erect, 

 beardless, ovate, compressed, enclosing the florets, one 

 of which is elevated on a footstalk ; flowering glumes 

 pointed, that of the male flower bearing an awn upon its 

 back ; palea smaller, awnless ; scales single, cloven, 

 membranous ; ovary ovate ; styles two, hair-like ; stig- 

 mas oblong, feathery ; seed ovate, attached to the har- 

 dened palea and flowering glumes ; axis of the spike- 

 let smooth. Species 2 : — 1. lanatus ; 2. mollis. 



Genus 21. Cynodon. Spikelets single-flowered ; 

 outer glumes nearly equal, florets awnless, placed on 

 one side of the spike. Species 1 : — dactylon. 



Genus 22. Spartina. Spikelets single-flowered, ses- 

 sile ; outer glumes boat-like, compressed, converging, 

 very unequal, pointed, the broader one striated ; flowering 

 glume longer than the smaller outer glume, but shorter 



