1905] Fernald & Knowlton, — Draba incana and its Allies 6 3 
different from other eastern members of the group but it seems to be 
a very close relative of D. borealis of the Behring Sea region. From 
that northwestern species it differs in several clear characters and it 
is here given specific rank. 
On the exposed limestone cliffs about Percé, at the tip of the Gaspé 
Peninsula, is a species with cuneate basal leaves, and a very peculiar 
short oblong silique. This is crowded with seeds, which overlap so 
closely as to produce angulate edges. The funiculus is very short, 
while in the other species here discussed it is half as long as the seed. 
This plant is so clearly marked that it also seems justly entitled to 
specific rank. 
There are numerous references to Draba incana throughout Amer- 
ican literature, but it has been impossible clearly to identify many 
of them. In the present treatment are cited only specimens actually 
seen; and the species are illustrated by detailed figures prepared by 
Mr. F. Schuyler Mathews. 
* Margins of basal leaves hirsute-ciliate with long simple hairs. 
D. incana, L. (Figs. 1, 2.) Biennial, or perennial by scattered off- 
shoots, caudex sub-simple: flowering stems usually single, occasion- 
ally 2 to 5, very leafy, 0.4-4 dm. high, densely pilose-hirsute: basal 
rosettes few; their leaves oblanceolate, subentire to sparsely sharp- 
dentate, 0.5-2.5 cm. long, green, loosely pubescent with simple and 
more or less stellate hairs; cauline leaves lanceolate to narrowly 
ovate, dentate, o.5-2 cm. long, pubescence as in basal leaves: 
racemes comparatively dense ; pedicels pilose-hirsute, in fruit mostly 
becoming 1.5-3 mm. long (lowest rarely 1 cm. long):  siliques 
appressed-ascending, oblong, flat or slightly contorted, acutish, 7— 
ro mm. long, 2-3.5 mm. broad ; stigmas sessile or sub-sessile; valves 
glabrous: seeds not crowded, 0.9-1.4, average 1.08 mm. long.— 
Sp. 643, in part (1753) ; Reich., Ic. Crit. viii, t. 769 (1830) ; Reich., 
Ic. Fl. Germ. ii. t. 14, fig. 4249 (1837); Hook., Trans. Linn. Soc. xxiii. 
317 (1861); Watson in Gray, Syn. Fl. i, pt. 1. 111, in part (1895). 
D. contorta, Ehrh., Beitr. vii. 155 (1792); DC., Syst. ii. 348 (1821). 
D. incana, a, Hook., Fl. Bor-Am. i. 55 (1830) ; Torr. & Gray, Fl., 
107 (1838). D. incana, a legitima, Lindblom, Linnaea, xiii; 331 
(1839); Koch, Syn. Ed. 2, i. 70 (1843). D. incana, y diffusa, Lind- 
blom, l. c. (1839).— Northern Europe, Iceland and Greenland: 
LABRADOR, Rigoulette, Aug. 25, 1891 (Bowdoin Coll. Ex., no. 269) ; 
