. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 6 MASS. EXPERIMENT STATION BULLETIN 402 All the flower buds within a terminal bud may be killed without injury to the embryonic leaves or to the apex of the stem axis within the terminal bud. In this case, the new growth of the uprights develops as usual except that there are no flower buds although vestiges of them may be found by examination with a hand lens. Sometimes evidence that flower buds had been formed is shown by the presence of the pedicels, each bearing two small leaves (bracts) at its summit
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 6 MASS. EXPERIMENT STATION BULLETIN 402 All the flower buds within a terminal bud may be killed without injury to the embryonic leaves or to the apex of the stem axis within the terminal bud. In this case, the new growth of the uprights develops as usual except that there are no flower buds although vestiges of them may be found by examination with a hand lens. Sometimes evidence that flower buds had been formed is shown by the presence of the pedicels, each bearing two small leaves (bracts) at its summit with a very small dead structure between them representing a flower bud killed very early in its development. Injury which does not kill all or most of the embrj^onic leaves within a terminal bud may kill small areas of tissue within individual leaves varying from a few cells up to half a leaf. Portions of leaves remaining uninjured continue their development when the terminal bud begins active growth in the spring, but the leaves developed therefrom are then more or less deformed (Fig. 2). Apparently all or most of the flower buds are killed when embryonic leaves are injured in this Figure 2. Uprights from Vines of the Howes Variety from a Bog near Waquoit Massachusetts showing severe injury to the new leaves caused by a lack of dissolved oxygen in the water diving the preceding winter-flooding period. Water was held late. Most of the flower buds were killed at a very early stage of their development; two buds on the upright at the extreme right made some growth but died before blossoming. Collected June 29, 1937. X 1. Incompletely differentiated flower buds may be injured but not killed imme- diately. These buds continue their development for some time but die sooner or later; the more severely injured ones die at early stages of growth, those less severely injured die later, very often developing into flowers which fail to set fruit. This delayed efi^ect of injury sho
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