Efflorescence habit of hop plant

Abstract

We researched the efflorescence habit of hop during two yeard, 1949 and 1950. The resaults obtained are summarized as follows. 1. The order of efflorescence varies according to the sexuality of hop stocks. 1) The female stock set the flower balls at the tops of its lateral branches and branchlets. While the male stock is quite different. 2) The branchlets were observed to shoot gradually in orders in female stocks, while the shooting occurs simultaneously in male stocks. 3) The duration of efflorescence period of male stocks was shorter than that of female stocks. 4) The lateral branches and branchlets of female stocks grew opposite at each node of the stem and branches, while greater part of those of male stocks shoot alternately at each node. However, as to the orders of efflorescence on lateral branches, both male and female stocks, behaved similarly. Efflorescence began at a lateral branch which bad grown comparatatively near the foot, and extended towards both upper and lower lateral branches. This is performed systematically according to a certain rule. 2. The time of efflorescence is 6.00-8.00 a.m. on the male flower, and 6.00-10.00 a.m. on the female flower.