【摘要】 大叶杨的雌花、雄花和两性花均具有较发达的花被;雌蕊具3(—5)枚分离的花柱,子房1室,具16—34枚胚珠,每朵雄花具41—110枚雄蕊,花药的药隔突出;出现两性花、杂性花及雌雄同株现象。根据大叶杨和其他各种杨树的形态比较,初步设想:大叶杨是杨属中最古老最原始的树种之一,我国中部至西南部(包括大叶杨原产地在内的地区)是世界最古老最原始的杨树分布中心。更多还原

【Abstract】 The results of this study,which involved macroscopic,microscopic and SEM investigation of flowers of Populus lasiocarpa Oliv.,may be stated as follows: 1.Female,male and bisexual flowers possess well developed perianth greenish in color with obvious veins and glandular teeth.The branched vascular bundles and stomata apparatus are observed in the transection of the perianth.It suggests that the perianth is homologous with the leaf.2.Each pistil of female and bisexual flowere possesses 3(—5) separate styles.The ovary is 1-celled with 16—34 ovules.Each male flower has 41—110 stamens.The connective of stamen is protrusive.Presence of bisexual,polygamous flower and monoecism is not rare. 3.In comparison with several other species of Populus,P.lasiocarpa is supposed to be the most ancient and primitive species of the Populus.The central and south-west China perhaps is one of distributional center of Populus.更多还原