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. The Ovule Structure and Development of Male and Female Gametophytes in Araentotaxus Developments of Male and Female Gametophytes of ‘Ziyingui’, an Osmanthus fragrans Variety Anatomical Studies of Male and Female Gametophytes in Development of Lonicera maackii (Rupr.) Maxim Megasporogenesis,Microsporogenesis and Development of Female and Male Gametophytes of Flue-cured Tobacco ‘Nanjiang 3’