STUDIES IN THE CRUCIFER. 123 
once that this large leaf-like organ was one of the cotyledons, 
and really the only one that ever emerged from the seed- 
coat. Of the other, only a dead trace could be found, and 
that with the remains of its enveloping seed-coat still cover- 
ing it, and quite above ground. 
The genuine Cardamine species, it is known, have small 
and equal cotyledons, even as these appear in well developed 
and growing seedlings! It is therefore to be hoped that 
future research may lead to a better establishment of Den- 
taria and Cardamine as genera distinguishable not by habit 
alone, but by seminal and vegetative characters. The group 
of species with fleshy-rhizomatous and fleshy-tuberiform 
and tuberiferous roots may in the meantime be provisionally 
indicated as coastituting the genus Dentaria. This will be 
better than the proposing of the many western and the few 
eastern species as forming a new genus intermediate between 
the two. But the one thing which cannot rationally be al- 
lowed is, that the Dentaria series shall end absolutely arbi- 
trarily, as it does end in the Torrey & Gray Flora, and in 
Gray’s Synoptical Flora. 
The following far-western species. are to be transferred to 
DENTARIA, as are also the eastern ones already mentioned. 
D.cuNEATA. Cardamine cuneata, Greene, Bull. Calif. Acad. 
i. 74. : 
D. SINUATA. Cardamine sinuata, Greene, Eryth. i. 148. 
This was collected as far south as San Mateo Co., California, 
by Mr. J. Burtt Davy, soon after its first publication. 
D. PULCHERRIMA. Cardamine pulcherrima, Greene, l. c. 
. D. QUercerorum. Cardamine quercetorum, Howell, Eryth. 
hi. 33 
The two or three eastern species belonging with the above 
are much confused, as to their earlier bibliography. 
17 1 See Lubbock on Seedlings, i. 148, 149. 
