%A ZHANG Rui-Ju , , MA Hai-Ying , WANG Yue-Hua %T Early Floral Development of Endangered Euryodendron excelsum (Ternstroemioideae: Theaceae) %0 Journal Article %D 2007 %J Plant Diversity %R %P 648-654 %V 29 %N 06 %U {https://journal.kib.ac.cn/CN/abstract/article_30192.shtml} %8 2007-12-25 %X The floral development of a critically endangered plant Euryodendron excelsum from Ternstroemioideae (Theaceae) has been observed under scanning electron microscope (SEM) for the first time . The flower of E. excelsum is bisexual and teleianthous . Five sepal primordia are initiated 2􊄯5 spirally and arranged in one whorl when mature , and so are petals. Sepals and petals are initiated in the same order either clockwise or counterclockwise in the same flower . The androecial part is a ring primordium in the beginning . The first five stamen primordia are initiated on this ring primordium at antisepalous positions and then other stamen primordia appear on two sides of each of the first five primordia . Finally a total of 25 stamen primordia are initiated from the ring primordium and arranged in one whorl but could be grouped into 5 fascicles. Three sequentially initiated carpels compose an ovary which has an axile- central placenta with three locules and a truncate
and indehiscent stigma . The floral development of E. excelsum is distinctly different from plants in Theoideae .