ABSTRACT
The genus Euphorbia is a member of the spurge family, and consists of more than 1600 species of succulents, herbs, shrubs, trees, and cactus-like plants. Floral initiation and development in Euphorbia pulcherrima are regulated primarily by photoperiod, with a strong interaction of temperature. The inflorescence consists of showy bracts which subtend cymes of one to three or more cyathia. The critical daylength for continued floral development is shorter than for floral initiation. Temperature controls not only the rate of growth and development, as would be expected, but also modifies the critical daylength for floral initiation and possibly development. Temperature controls not only the rate of growth and development, as would be expected, but also modifies the critical daylength for floral initiation and possibly development.
