革苞菊胚胎学研究 Ⅰ.大、小孢子发生和雌、雄配子体发育 Observation on Megasporogenesis, Microsporogenesis and Development of Female and Male Gametophytes of Catalpa speciosa Warder Comparative Studies on the Development of Male and Female Gametophytes Between Fertile Line and Male Sterile Line’s Flowers of Tagetes erecta L. Development of Male and Female Gametophytes between Fertile Line and Male Sterile Line’s Flowers of Catalpa bungei C.A.Meyer.