62 Rhodora [APRIL 
matted rosettes at the base, thin, slightly pubescent green leaves, 
and smooth, narrow, much twisted siliques, terminated by a very 
distinct style. This is the familiar smooth-podded plant of northern 
Vermont and northern New York. Its range is the St. Lawrence 
valley, from the Great Lakes to the Gulf, with occasional stations in 
Vermont and central Maine. D. glabella, Pursh, from Hudson Bay, 
is referred to this species by Torrey and others. Material of this has 
not been seen, nor has any from the Hudson Bay region been accessi- 
ble, so it cannot be stated definitely what the name stands for. It is 
referred tentatively to the first variety described below. Another 
plant mentioned by Torrey & Gray,' as D. arabisans B (D. Longii, 
Schwein. in herb.) from Lake Superior, is somewhat obscure, but 
apparently is merely a short-styled extreme. The first variety of 2. 
arabisans described below is a constant form occurring frequently in 
Wabrador, the Gaspé Peninsula, and adjacent Quebec and northern 
New Brunswick. It is clearly marked by smaller size and shorter, 
not twisted siliques. To this species, D. arabisans, also is referred 
the local D. canadensis, Brunet, a plant with very short ovate siliques, 
known from a single station only on the northern shore of the lower 
St. Lawrence. 
The American plant with pubescent siliques which has passed for 
D. incana in Gray’s Manual and other works, is a species of wide 
distribution, for it is found in northern Asia, alpine Europe, and at 
different stations in eastern North America as well as in the Rocky 
Mountains. It has been called by various names, but as Koch 
plainly demonstrates,” it is properly the D. sty/aris of Gay, not D. 
confusa of Ehrhart, to which it is often referred. This plant is clearly 
separated from D. incana by the canescent pannose-stellate pubes- 
cence of the leaves, which entirely lack the longer simple hairs of 
that species. It is much less leafy, and the silique is tipped by a 
distinct style. Schlechtendal has described a Labrador plant as D. 
Henneana, which seems from his description to be identical with D. 
stylarts. 
A peculiar plant was collected in 1902 by E. F. Williams and M. 
L. Fernald at Paspébiac, Quebec, where it covered an extensive 
gravelly beach. It is coarse and scabrous, with elliptic siliques and 
very large seeds, 1.33 to 1.5 mm. long. The plant is strikingly 
1 Fl, N. Am. i. 106 (1838). ? Koch, Syn. ed. 2, i. 70 (1843). 
