254 PITTONIA. 
Collected 26 June, 1897, on Seal Island n. 1, Dawson 
Harbor, Queen Charlotte Islands, B. C., by Dr. Newcombe; 
and being the most southerly species, so far as known, of 
this peculiar group of plants. As to its pods, this is as 
much like some conceivable overgrown long-podded Draba 
as the first is like a Cochlearia. 
The specimens were communicated by Mr. Macoun, and 
the types are in his herbarium. 
lobANTHUS DENTATUS. Arabis dentata, Torr. & Gray, Fl. i. 
80(1838). The exceedingly multifarious and unsatisfactory 
Arabis of general acceptance is still without any habita 
group to which this plant can be referred. It stands alone, 
as an Arabis; not having even the distinctly flattened pods 
which the character of that genus calls for. But it is, both 
habitally and in its subterete siliques with some constric- 
tion between the seeds, altogether a good Jodanthus. 
Notes on VIOLETS. 
VIOLA RoTUNDIFOLIA, Michx. Since the announcement, 
made by me a year ago at pages 142 and 148 of this volume, 
that our woodland species of blue-flowered acaulescent violets 
produce their apetalous flowers under ground, several of us 
who pursue the study of these plants with special zeal have 
questioned among ourselves whether V. rotundifolia, our 
yellow-flowered acaulescent species, would not prove to have 
underground flowers; it being also a woodland species. As 
this one is not only northern, but also something of a moun- 
taineer, the data of its life history have been less accessible. 
However, late last August, while botanizing among the 
mountains of Lycoming County in northern Pennsylvania, 
I found myself in the midst of a luxuriant growth of the 
plant, and at once detected, by digging, its quite copious 
subterranean unisexual but seed-producing flowers; and I 
