THE IDENTIFICATION OF VARIETIES OF BAELEY. 25 
f<cri}i(j€i Kornicke (1882. p. 206. as var.). a browu form of H. deficiem 
steudelii (26). 
subatterbergii Kornicke (1908, p. 430, as var.), synonym for H. i. nudiJiaxtoni 
nuditransiens ( 13 ) . 
sudcompositum Kornicke (1908, p. 434. as var.), a compound form of H. 
dlsticlion nudum (21). 
suhhaxtoni Kornicke (1908, p. 429, as var.), an indefinite variation of H. i. 
nudiliaxtoni (13). 
spurium Atterberg (1899. p. 11), varieties with neitlier crease nor depression 
at base of gi-ain. 
tetrastichum Kornicke (1822, p. 125), all lax vulgare. 
tortile Seringe (1841, p. 349), a 6-rowed barley with malformed awns ap- 
proaching hoods. 
tortile Robert (1832, according to Seringe, 1841. p. 349), probably as above. 
iortilis Heuze (1872, p. 457), probably as tortile Ser. 
iriangulare Kornicke (1908, p. 432, as var.), synonym for H. distichon angus- 
tispicatum furcatozeocriton (19). 
utriculatnm K. H. in Beaven (1902, p. 579, as var.), synonym for H. disticlion 
lax urn (23). 
verum Atterberg (1899, p. 11), all varieties with transverse crease at base of 
grain. 
riolascens, K. H. in Beaven (1902. p. 578, as var.). synonym for H. distichon 
palmeUa canescens (17). 
walpersii Kornicke (1882. p. 182, as var.). synonym for H. v. coeleste (5). 
LINES FOR FURTHER STUDY. 
The various characters upon which varieties have been founded 
have been discussed in connection v^ith the keys and lists of varieties. 
Between most of the characters retained in the keys, the distinctions 
are quite sharp. There are a few, however, which are not exactly 
clear and which offer attractive fields for study. 
The question of color is not on an entirely satisfactory basis. 
Colors are apparently the results of minor phases of metabolism, but 
have been utilized in taxonomic work because of the fact that they 
are conspicuous. Doubtless many more important features of metab- 
olism are ignored in the grouping of varieties. Being a question 
of metabolism, and usually one of the altered metabolism of ap- 
proaching maturity, it is questioned whether environment may or 
may not affect the production of pigment. This is particularly 
worthy of study m the blue and purple colors. 
The variations of density are equally suggestive. There is no ap- 
parent reason why a strain of any given density can not exist, and 
in the grouping of varieties it would.be worth while to know if there 
is even a narrow gap between the dense and lax forms. Possibly 
density, which has here been reduced to a subvarietal distinction, 
may have to be eliminated altogether. The separation of deficiem 
and distichon also presents possible difficulties. Hybrids of deflciens 
