278 Scientific Intelligence. 
of congeneric types.” It amounts to this quite familiar idea, that the 
common causes of those ordinary variations which depend upon external 
genera admitted are still too numerous. In the present essay he extends 
Sisymbrium beyond Bentham and Hooker’s limits, to comprise Braya, 
Halimolobus, and Eutrema. Upon the monograph of Sisymbrium we 
wish to comment upon three or four American species :— 
common introduced weed, S. officinale “ fere unico pedunculo filiformi.” 
The fruiting pedicels are 2 to 24 lines long and slender, ‘instead of onl 
ca. 
S. teres. The obscure Candamine teres of Michaux was doubtfully re- 
ra. Dr. Fournier bas 
up 
“ Siliques erect, one-third of an inch in length,” is rendered “ Siligue 
erect@, vir tertiam partem linee longe,” a very short silique indeed, to 
, as Miel he Flora above 
referred to, the cotyledons are said to be “ distinctly incumbent,” we are 
bound to direct attention to a remark in the first edition of Gray’s Manual 
of Botany, p- 34, where it is stated that “the plant appears clearly to be 
Nasturtium tanacetifolium or N. lyratum of the Southern States (coty/- 
edons accumbent /), which leads me to suspect a mistake in the record 
the locality.” So far as the portion of an tic specimen (given to 
the writer in 1839 by the late Achille Richard) allows the compari 
it accords fully ant collected be w Orleans by Dr. Riddell 
|! with a ; 
and by Berlandier (his No. 1940). Yet it may be a starveling V. palus- 
ire, and in that case reall eae Sha plai . 
