Floral organogenesis and development of Przewalskia tangutica Maxim.endemic to China and Hyoscyamus niger L., which belong to the tribe Hyoscyameae (Solanaceae), were studied using scanning electron microscope. They have three common characters of floral organ initiation and development: 1) initiation of the floral organs in the two species follows Hofmeister’s rule; 2) the mode of corolla tube development belongs to the “late sympetaly” type; 3) primordia of the floral appendages initiated in a pentamerous pattern and acropetal order. But initiation of the calyx lobe primordia showed different modes in these two species. The calyx lobe primordia of H. niger have simultaneously whorled initiation, while those of P. tangutica have helical initiation, but the five calyx lobe primordia form a ring after all five calyx lobe primordia occur. The systematic significance of the present results in the genera Hyoscyamus and Przewalskia is discussed in this paper.
茄科马尿泡和天仙子的花器官发生
杨冬之1 张志耘1* 路安民1 孙 坤2 刘健全3
（1. 中国科学院植物研究所系统与进化植物学重点实验室，北京100093；2. 西北师范大学生物系，兰州730070；3.中国科学院西北高原生物研究所，西宁81001）
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