Abstract
There are some opinions not coincident in relation to the flower bud initiation of Easter Lilies (Lilium longiflorum var. insulare Hort.). Hereupon, the experiments were carried out to determine the correct time of flower bud differentiation in the favorite plant.
The bulbs used were transported from Tanegashima Island and were selected conveniently as being 36gr. in average weight.
Under the normal conditions in Yokohama, the intial primordia were apparently growing out from some of bulbs on March 12. Ten days after, on March 22, two primordia, the one being more or less larger than the other, appeared on the bulbs showing 35%. It is the predifferentiation stage of flower buds, must be. On March 31, the outer tepals of the first flower were observed in differentiating as individual primordium. This should be called as the differentiation stage of flower buds, at least in Easter Lilies. On April 10, about 10 days after the differentiation stage, the intial development of the inner tepals and stamens were individually distinguished. After then, the initial formation of pistils and of initial pollens and ovules were normally progressed, occurring on April 20 and May 20, res pectively. The flowers commenced to bloom on June 18.
