Anatomic Observation on Female Flower Development,Megasporogenesis and Embryo Development of Fraxinus mandshurica水曲柳雌花发育、大孢子发生及胚胎发育的解剖学观察
THE ANATOMIC OBSERVATION OF THE DEVELOPMENT OF FEMALE FLOWER MEGASPOREGENSIS AND THE DEVELOPMENT OF EMBRYO OF BETULA PLA白桦雌花发育、大孢子发生及胚胎发育的解剖学观察