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Synopsis Photoperiodic response in crimson clover was greatly affected by temperature. Earliest flowering occurred when plants six weeks old were shifted from outside cold frames into a greenhouse with relatively high temperature. High night temperatures from germination to maturity inhibited flower production. Crimson clover flowered earlier as length of photoperiod increased. Under long daylengths the plants produced smaller seed heads, fewer leaves, less branching and greater height than under the shorter photoperiods.

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