TYPE 10. GRAINS SIMPLE, STRUCTURE OBSCURE. 245 



Bro7nus rubens Linn. Dry seed. — Grains rounded, rounded-reniform, oval, frequently somewhat 

 angular, the broad ones compressed to about half their wiilth. Length about 13 to 17m. 



Bromus erectus Huds. Dry seed. — Grains rouniled, rounded-reniform, oval, shortened-conical, 

 usually irregidar; the broad ones compressed to about half their wiilth; from the narrow aspect 

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



Bromus steriUs Linn. Dry seed. — Grains rounded and romided-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/u. 



Brotnus lecturum 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 23^. 



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

 angles, oval, shortened-conical; usually more or less irregular; the broad ones compres.sed 

 to about one-half and over of their width. Length about 18/<. 



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-conical; occasionally 

 somewhat irregular; the liroad 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 caucasicus Fisch. Dry seed. — Grains rounded, oval, shortened-conical, visually 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 often irregular and angular, 

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



Bromus (deutensis Tiin. Dry sced.^Gr&ins rounded-oval, oval-oblong, elongated-triangular; some- 

 times reniform or quadrangular, freciuently somewhat irregular; half to almost as broad 

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

 about 14^. Among the above some compound grains of 2 to 3 equal components are 

 observed. 



Bromus longijlorus 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/^. A central cavity is sometimes seen in each 

 half of the constricted grains, 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 12yu. 



Bromus brizwformis F. & M. Dry seed. — Grains oval, oblong, conical; occasionally slightly com- 

 pressed. Length about 6/i- 



Bromus lanceolatus Roth. Dry seed. — Grains oblong, rarely rounded. Length about 6yu. 



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

 Grains rounded-oval to oljlong; 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 12^. 



Bromus schraderi Kunth; Ceralochloa penduki Schrad. Dry seed. — Grains rounded, reniform, oval, 

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



Bromus unioloides Willd. ; Ceralochloa unioloides DC. Dry seed. — Grains as in the preceding species, 

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

 slit-hke cavity. 



Bromus commulatus Schrad. Dry seed.— Grains rounded to oblong; frequently somewhat anguhu- 

 or irregidar; two-fifths to almost as broad as long; the broad ones rath(>r strongly compressed. 

 Length about 13^- 

 Bromus inermis Poll. Dry seed. — Grains rounded-oval to oblong; broad ones compre.ssed to half 

 their width. Length about lO/j. 



