REVIOUS workers have obtained hybrid seedlings from diploid Fragaria P vesca x cultivated strawberry, but they were always sterile so that new types never became established. -4 colchicine-induced autotetraploid of F. vesca L. (DERMEN and DARROW 1938) when used in a series of crosses with the octoploid cultivated strawberry ( x F. ununassa Duch.) has given hybrids varying in fertility from comp...