as A TENT-BOoUOk OF BOTANY 
inner (younger) ones, and all the leaves protect the delicate 
growing apex of the stem or the branch. There are what 
are called Jeaf-buds and flower-buds, but only the former 
will be considered here. 
29. Position of buds.—In shrubs and trees the growth 
of stem and branches is not continuous, but is interrupted 
during the winter. Preparatory to this 
interruption a bud is formed at the end of 
each growing axis, and is called the termi- 
nal bud (Fig. 66). When it opens the fol- 
lowing scason it continues the growth of 
the stem or branch. Buds are formed also 
in the axils of leaves, usually one bud in 
an axil, and hence they are called azil- 
lary buds (ig. 66). When they develop 
they form new branches. When the ter- 
minal buds are stronger than the axillary 
buds, the main stem or branches continue 
to elongate year after year; but if the 
axillary buds are stronger, the growth of 
the new branches may replace that of the 
stem from which they arise. For exam- 
_, ple, in the common lilac the two buds in 
Fic. 66.—Sealy buds j : 
of hickory: termi. the axils of the uppermost opposite leaves 
pele eri develop branches, the terminal bud_ be- 
lary as shown by tween them not continuing the growth 
ale asaaed of the axis, and often not even being 
formed. Hence the lilac bush is charac- 
terized by its forked branching, cach axis appearing to end 
ina pair of branches. Axillary buds do not all develop into 
branches by any means, but any of them may do so under 
certain conditions. If the terminal bud is injured or is fee- 
ble, the ax‘llary bud or buds nearest to it will be more 
likely to develop branches; and if the upper axillary buds 
are injured, the next lower ones will develop, and so on 
