An investigation on the probable causes for the endangerment of Plagiopteron suaveolens Griffith
斜翼致濒原因探讨

Plagiopteron suaveoleas is extremely endangered in the wild and would become extinct if proper protective and propogational measures are not taken. It is scattered in Burma, Thailand and China. The population in China has flowers in blooming throughout a year, but flowers fall after blooming, and very few fruits and no seeds have been found to develop. Embryologically the plant develops normally until the organization of eight-nucleate embryo sac, but afterwards the antipodals secondarily increased, and the elements of embryo sac disintegrates finally, hence embryo sac becomes empty. The probable failure in successful pollination and fertilization leads to the collapse of embryo sac. Stained with malachite green-acid fuchsin -orange G,38 per cent of pollen grains are fo und to be sterile and this is possibly one of sexual propogation barriers. Inlocalities the recent massive clearing of vegetation for cultivation of economic plants leads in turn to the clearing of plants and this species becomes extremely endangered.