IRbodora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 7 | April, 1905 No. 76 
DRABA INCANA AND ITS ALLIES IN NORTH- 
EASTERN AMERICA. 
M. L. FERNALD AND C. H. KNOWLTON. 
i$ 
(Plate 60.) >» 
RECENT collections of the Draba incana group, especially those 
from the Gaspé Peninsula in Quebec, have shown clearly that former 
treatments have not fully covered the eastern North American mate- 
rial, which has heretofore been mostly referred to 2. incana, L., and 
D. arabisans, Michx. A careful study of D. incana, as interpreted 
by Koch! and other European authors, shows that this plant is not 
represented in the eastern United States. True D. incana is clearly 
marked by the margins of the basal leaves, which are hirsute-ciliate 
with long simple hairs. It is mostly a simple, very leafy plant, with 
few basal rosettes, densely pilose-hirsute leaves, and sessile or sub- 
sessile stigmas. ‘This is the common plant of northern Europe, Ice- 
land and Greenland. On this continent it is found in Labrador, 
Newfoundland, eastern Quebec (Percé), and one specimen has been 
seen from Bathurst, New Brunswick. It is therefore apparently con- 
fined to the northeastern coast, and is scarcely to be expected inland 
or southward. A form with pubescent siliques seems to have the 
same range both here and in Europe, and is referred to var. confusa 
of Poiret. This is the var. hebecarpa of Lindblom and the D. confusa 
of Ehrhart, as Lindblom has clearly shown.? x 
D. arabisans of Michaux is a very distinct American species of 
definite range. It is a tall, rather slender, branching plant, with 
1 Koch, Syn. ed. 2, i. 70 (1843).,  ? Lindblom, Linnaea, xiii, 332 (1839). 
