ranches, they
would stifle each other. But some of them are commonly flower-buds: in
the Red Maple, only the middle one is a leaf-bud, and it does not grow
until after those on each side of it have expanded the blossoms they
contain.

[Illustration: Fig. 78. Butternut branch, with accessory buds, the
uppermost above the axil.]

[Illustration: Fig. 79. Red-Maple branch, with accessory buds placed
side by side. The annular lines toward the base in this and in Fig. 72
are scars of the bud-scales, and indicate the place of the winter-bud of
the preceding year.]

60. =Sorts of Buds.= It may be useful to enumerate the kinds of buds
which have been described or mentioned. They are

_Terminal_, when they occupy the summit of (or terminate) a stem,

_Lateral_, when they are borne on the side of a stem; of which the
regular kind is the

_Axillary_, situated in the axil of a leaf. These are

_Accessory_ or _Supernumerary_, when they are in addition to the normal
solitary bud; and these are _Collateral_, when side by side;
_Superposed_, when one above another;

_Extra-axillary_, when they appear above the axil, as some do when
superposed, and as occasionally is the case when single.

_Naked buds_; those which have no protecting scales.

_Scaly buds_; those which have protecting scales, which are altered
leaves or bases of leaves.

_Leaf-buds_, contain or give rise to leaves, and develop into a leafy
shoot.

_Flower-buds_, contain or consist of blossoms, and no leaves.

_Mixed buds_, contain both leaves and blossoms.

61. =Definite annual Growth= from winter buds is marked in most of the
shoots from strong buds, such as those of the Horse-chestnut and Hickory
(Fig. 72, 73). Such a bud generally contains, already formed in
miniature, all or a great part of the leaves and joints of stem it is to
produce, makes its whole growth in length in the course of a few weeks,
or sometimes even in a few days, and then forms and ripens its buds for
the next year's similar growth.

62. =Indefinite annual Growth=, on the other hand, is well marked in
such trees or shrubs as the Honey-Locust, Sumac, and in sterile shoots
of the Rose, Blackberry, and Raspberry. That is, these shoots are apt
to grow all summer long, until stopped by the frosts of autumn or some
other cause. Consequently they form and ripen no terminal bud protected
by scales, and the upper axillary buds are produced so late in the
season that they have no time to m