GRASSES OF BRITAIN. 281 



Stigmas feathery. Filaments three, slender, short. Anthers very 

 small, notched at each end. 



Obs, — Bromus squarrosus is distinguished from Bromus patulus 

 in the spikelets being of an oblong lanceolate form; outer palea 

 broader, twice the breadth greater than its length ; aicns, when dry, 

 divaricating very conspicuously, and arising from the outer palea 

 about one-fourth from the summit ; — whereas in Bromus patulus the 

 spikelets are longer, of a lanceolate form ; outer palea twice as long 

 as broad ; aians but slightly spreading, and arising from the outer 

 palea much nearer the summit ; the panicle larger and the branches 

 more spreading. The two grasses are closely allied, but very dis- 

 tinct. 



Bromus squarrosus is distinguished from Bromus arvensis in the 

 spikelets being of a more oblong form ; outer palea nine-ribbed, twice 

 the breadth greater than its length ; inner palea much shorter than the 

 outer palea, not reaching further up than to the base of the awn ; the 

 aivns divaricating ; — whereas in Bromus arvensis the spikelets are li- 

 near, lanceolate; outer palea seven-ribbed, and twice as long as 

 broad ; inner palea as long as the outer palea, and the awns not diva- 

 ricating. 



Bromus squarrosus is distinguished from Bromus commutatus in 

 the outer palea being nine-ribbed, and twice its breadth greater than 

 the length ; awns divaricating, arising from the outer palea, about 

 one-fourth fi'om the summit ; — whereas in Bromus commutatus the 

 outer palea is seven-ribbed, and twice as long as broad ; aivns not 

 spreading, and arising from the outer palea much nearer the summit. 



Bromus squarrosus is distinguished from Bromus secalmus in the 

 outer palea being nine-ribbed, the upper half forming an obtuse 

 angle ; aivns divaricating, arising from the outer palea, about one- 

 fourth from the summit; — whereas in Bromus secalinus the outer 

 palea is seven-ribbed, and rounded at the summit; aicns straiglit, 

 and arising from the outer palea much nearer to the summit. 



Bromus squarrosus is distinguished very easily from Bromus ra- 

 cemosus and Bromus mollis in the apex of the large glume being half- 

 way between the base of the glume and the summit of the second 

 floret on the same side ; — whereas in Bromus rar-emosus and Bromvs 

 mollis the apex of the large glume is half-way between its base and 

 the summit of the third floret, or beyond. 



