Cyanoglucoside and Hydrolyzing Enzyme in Species Related to Trifolium Repens1

Trifolium repens L. and 16 species closely related to T. repens were tested qualitatively for the presence of cyanoglucoside and the enzyme that releases HCN by hydrolysis of glucoside in damaged leaves. In contrast to T. repens, none of these species contained enzyme in the absence of glucoside. Four species were comprised entirely of plants showing both constituents, one of plants showing glucoside only, and eight of plants showing neither constituent. The remaining three species were alike in that some plants contained glucoside and some did not.