TYPE 10. GRAINS SIMPLE, STRUCTURE OBSCURE. 245 



Bromus rubens Linn. Dry seed. Grains rounded, rounded-reniform, oval, frequently somewhat 

 angular, the broad ones compressed to about half their width. Length about 13 to 17/u. 



Bromus crcctus Huds. Dry seed. (trains rounded, rounded-reniform, oval, shortened-eonical, 

 usually irregiilar ; the broad ones ('ompressed to about half their width; from the narrow aspect 

 a longitudinal slit is frequently observed. Length about 13p. 



Bromus sterilis Linn. Dry seed. Grains rounded and rounded-triangular to oval, frequently some- 

 what angular or irregular; usually compressed to about one-half; with a central cavity or 

 median slit from which fissures occasionally radiate. Size about 36/ii. 



Broryms tectorum Linn. Dry seed. Grains rounded to oval, sometimes triangular and quadrangular 

 with rounded angles, frequently somewhat irregular; usually strongly compressed; from 

 the narrow aspect a longitudinal slit is observed. Length about 23m- 



Bromus adoensis Hochst. Dry seed. Grains rounded, triangular to quadrangular with rounded 

 angles, oval, shortened-eonical; usually more or less irregular; the broad ones compressed 

 to about one-half and over of their width. Length about ISft. 



Bromus ciliatus Linn. Dry seed. Grains rounded to oval, the broad ones compressed to half their 

 width; a central cavity is occasionally observed. Length about 14/i. 



Bromus brachystachys Hornung. Dry seed. Grains rounded, oval, shortened-eonical; occasionally 

 somewhat irregular; the broad ones compressed to about half their width; instead of a central 

 hilum, a cavity is present which is rounded from the broad aspect and cleft-like from the 

 narrow aspect. Length about 14yu. 



Bromus caucasiciis Fisch. Dry seed. Grains rounded, oval, shortened-eonical, usually irregular; 

 the broad ones compressed to about one-third of their width. Size about 12/i. 



Bromus laxus Hornem. Dry seed. Grains rounded to oval-oblong, very oftn irregular and angular, 

 and sometimes constricted in the middle; the broad ones compressed. Length about 14yu. 



Bromus aleutensisTrm . Dry seed. Grains rounded-oval, oval-oblong, elongated-triangular; some- 

 times reniform or quath-angular, frequently somewhat irregular; half to almost as broad 

 as long; the broad ones compressed to half their width. Length about 17 to 20ju, width 

 aliout 14ju. Among the above some compound grains of 2 to 3 equal components are 

 oliserved. 



Br(nmis longiflorus Willd. Dry seed. Grains rounded to oval-oblong, often somewhat irregular 

 and angular and frequently constricted in the middle; the broad ones compressed to a little 

 more than half their width. Length 10 to 12/i. A central cavity is sometimes seen in each 

 half of the constricted gi-ains, demonstrating that they are doublets without a visible line of 

 division. 



Bromus purgans Linn. Dry seed. Grains rounded, rounded-triangular to oblong, ovoid, and con- 

 ical; occasionally constricted in the middle; the broad ones compressed to one-third of their 

 width; from the narrow aspect a longitudinal slit is frequently observed. Length about 12^. 



Bromus brizceformis F. & M. Dj-y seed. Grains oval, oblong, conical; occasionally slightly com- 

 pressed. Length about 6^. 



Bromus lanceolatus Roth. Dry seed. Grains oblong, rarely rounded. Length about Qfi. 



Bromus velutinus Schrad., var. hordeaceus Gmel.; Bromus secalinus var. hordeaceus. Dry seed. 

 Grains rounded-oval to olilong; one-half to three-fourths as broad as long, the broad ones 

 slightly compressed, some have a central cavity. Length 10 to 11^. 



Bromus patulus Mert. & Koch. Dry seed. Grains rounded-oval to oblong, sometimes slightly 

 irregular, two-fifths to four-fifths as broad as long; the broad ones slightly compressed; 

 many with a central cavity. Length about 12fi. 



Bromus schraderi Kunth; Ceratochloa pendula Schrad. Dry seed. Grains rounded, reniform, oval, 

 oblong, frequently irregular; compressed, many with a central cavity. Length about 20ix. 



Bromus unioloides Willd.; Ceratochloa uuioloides DC. Dry seed. Grains as in the preceding species, 

 the broad ones compressed to one-half and more of their wiilth; many with a longitudinal 

 slit-like cavity. 



Bromus cornrnutatus Schrad. Dry seed. Grains rounded to oblong; frequently somewhat angular 

 or irregular; two-fifths to almost as broad as long; the broad ones rather strongly compressed. 

 Length about 13/i. 



Bromus inermis Poll. Dry seed. Grains rounded-oval to oblong; broad ones compressed to iialf 

 their width. Length about 10^. 



