16 
BULLETIN 57, HAWAII EXPERIMENT STATION 
Detached spike. — In this type the spike is detached from the parent 
rootstock and used for seed. 
Fio. 10.— Bud formation on immature surface type of canna root- 
stock. The buds c and 6 constitute the vigorous primary growth 
of the hill; a usually remains dormant or produces a small second- 
ary growth 
Fig. 11.— Secondary types of canna seed: A, Small, primary growth; B, C, and D, secondary growth 
Mature rootstocJcs with dormant buds. — Usually one or two buds in 
this type have developed into rootstocks, and the remaining bud or 
buds exist in a dormant condition for many months. The parent 
