On a discontinuous variation occurring in Biscutella lævigata

The observations recorded in this paper were made upon Biscutella Iævigata , a cruciferous plant occurring as a perennial herb in the alpine and sub-alpine regions of middle and southern Europe. It was observed by Mr. Bateson that in a valley of the Italian Alps this species exhibits two distinct forms, which exist side by side, the one hairy and the other glabrous. Plants showing various degrees of hairiness, and constituting a series of intermediate forms connecting the two extremes, were also found, but were comparatively scarce.