Therefore, within Celeastaceae, an axillary dichasium may be the basic type or unit of inflorescences. An analysis of character evolution suggested that a dichasium is the ancestral state for Celastraceae.
A dichasium in the leaf axil as commonly seen in Euonymus is the most frequent type of inflorescence in Celastraceae. orbiculatus that the reduction of subtending leaves of the axillary dichasia on a developing flowering shoot made it become a terminal thyrsoid. Thus, the question has arisen-how have these varieties evolved or transformed from one to another? Through morphogenetic observations using paraffin sections, scanning electron microscopy (SEM), and stereomicroscopy, we studied the architecture and developmental processes of the inflorescences of five species of Celastrus and Euonymus. Under this basic pattern, many inflorescence forms have been described within the family, e.g., dichasium, monochasium, pleiochasium, botryoid, thyrsoid, fascicle. Laboratory of Systematic Evolution and Biogeography of Woody Plants, College of Nature Conservation, Beijing Forestry University, Beijing100083, ChinaĬixi Municipal Bureau of Agriculture, Cixi, Zhejiang Province 315300, ChinaĬyme, Celastrus, Euonymus, inflorescence architecture, morphogenesis, transition AbstractĬelastraceae are characterized by a cymose pattern of inflorescence ramification.
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