IV. CRUCIFERÆ.
11. Cardamine pratensis, L., var. angustifolia.—B.
Island near the centre of Boyd Lake. Limestone Island, in Nicholson Lake. Fort Churchill.
12. Arabis lyrata, L.—W.
North shore of Lake Athabasca.
13. Arabis humifusa, var. pubescens, Wat.—W.
North-west angle of Lake Athabasca. Esker, near the Narrows of Daly Lake. This species had not previously been found west of Hudson Bay.
14. Barbarea vulgaris, R. Br.—W.
Cracking Stone Point, north shore of Lake Athabasca. Red Hill, on the west shore of Hinde Lake.
15. Sisymbrium humile, C. A. Meyer.—W.