CuapPtTer VIII 
THE BUD 
Bups are short, young, undeveloped stems or shoots with 
rudimentary leaves compactly arranged upon them. 
The plumule represents the first bud on the initial stem or 
caulicle. 
Scaly buds are such as have their outer leaf rudiments trans- 
formed into scales; these are often coated with a waxy or resinous 
substance without and a downy lining within to protect them 
from sudden changes in climate. Buds of this character are 
common among shrubs and trees of temperate regions. The 
official Poplar Bud is an example. 
Naked buds are those which are devoid of protective scales. 
They are common to herbaceous plants. The rose buds, head of 
cabbage or brussels sprouts are good examples. 
CLASSIFICATION OF Bups AccoRDING TO DEVELOPMENT.—1. A 
leaf bud is a young shortened shoot bearing a number of small 
rudiments of leaves. It is capable of elongating into a branch 
which bears leaves. The leaf buds of Populus balsamifera and 
P. candicans are official in the National Formulary. 
2. A flower bud is a rudimentary shoot bearing one or more 
concealed and unexpanded young flowers. The drug Clove is 
an example of a flower bud which, if allowed to expand, would 
form a single flower. 
3. A mixed bud is an undeveloped stem or branch bearing 
concealed, unexpanded leaves and flowers. The buds which 
give rise to flowers and leaves on the apple trees are mixed buds. 
CLASSIFICATION OF Bups AccoRDING TO PosITION ON THE 
Stem.—1. A terminal bud is one which is located on the end of a 
stem (shoot). It is capable of elongating into a shoot which 
bears leaves or both leaves and flowers. 
2. An axillary or lateral bud is one which arises in the leaf axil. 
It is capable of giving rise to a side branch or to a flower. Occa- 
184 
