Cytological examination of Scilla peruviana L. during a 20-month cycle of growth and development

The growth cycle of Scilla peruviana L. involved the development of two gen erations of daughter bulbs enclosed within each mother bulb. Flower initiat ion of the primary daughter bulb took place in June as the mother bulb appa rently entered dormancy. Floral differentiation was complete by late Octobe r) by which time the apical meristem of the secondary daughter bulb had dev eloped for 3 months inside the primary daughter bulb. The complete cycle of ontogenesis, from meristem initiation to flowering, occurred without inter ruption and required 20 months. Small zones of meristematic cells detected at the bases of bulb scales may be the origin of adventitious bulblets in t his species. This detailed cytological study enabled the development of an effective commercial forcing program for S. peruviana.