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Cyanogenesis in Clover
![Figure WN18.4 - Clover (Trifolium repens) is polymorphic for the ability to produce cyanide.](ch18/WN18_04.jpg)
Figure WN18.4.
Clover (Trifolium repens) is polymorphic for the ability to produce cyanide. Cyanogenesis is a defense against herbivores, but it can be costly to the plant itself if frost damage causes the release of cyanide. Cyanogenesis therefore increases with mean January temperatures and follows a broad cline that runs parallel to mean January temperature isotherms (heavy lines). (Redrawn from Daday 1954, Fig. 2.)
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