树木学上记载,杨树雌雄异株.但在我场种籽园内,发现有两株杨树已由雌雄异株转化为雌雄同株.一株是欧洲黑杨,去年(1981)由杨庭兰同志发现的;一株是小美8273杨,今春我们在搞杂交育种水培花枝时,由王旭同志发现的.当时,经笔者在显微镜下进一步观察,确认为雌雄同株.在同一根花枝上不但有雌花序,也有雄花序;而且有的花序上,同时开有雌花和雄花. Arboreal records, poplar dioecious, but in my field seed garden, two poplars have been found from dioecious to hermaphroditism .One is a black poplar, last year (1981) by theYang Tinglan Comrade found that one is a small US 8273 Yang spring this spring when we engage in crossbreeding hydroponics branch, was discovered by Comrade Wang Xu .At that time, the author further under the microscope, confirmed as monoecious .In the same root branch Not only on the female inflorescence, there are male inflorescences; and some inflorescence, at the same time there is a female flowers and male flowers.