Chapter D

Deciduous—Falling off, usually at the close of the season.
Defoliation—Removal of foliage.
Dehiscent—Splitting open at maturity.
Deliquescent—Said of the form of a tree with a broad spreading
habit. The branches sub-divide until they apparently
disappear.
Deltoid—Triangular like Greek symbol for delta.
Dentate—Toothed, usually with the teeth directed outwards.
Diffuse-porous—Equal-pored. Said of wood when pores in a growth
ring are equal in size.
Dioecious—Unisexual, with the staminate and pistillate flowers on
separate plants.
Disseminated—Scattered, thrown, broadcast.
Divergent—Pointing away; extending out. Said of buds which point
away from the twigs.
Downy—Covered with fine hairs.
Drupe—A fleshy fruit with a pit or stone like a cherry.

E
Elliptical—Shaped like an ellipse with sloping ends.
Elongated—Long, drawn out.
Entire-margined—Margin smooth, not cut or toothed.
Excurrent—Said of a tree with a continuous trunk and erect habit
of growth.
Exfoliation—Splitting or cleaving off of outer layers of bark.
Exotic—Of foreign origin.
Exudation—Oozing out of sap, resin, or other juice.

F
Fascicle—A close bundle or cluster.
Fetid—Ill smelling.
Fissures—Grooves, furrows, or channels as in the bark.
Fluted—Grooved, corrugated, channeled.
Follicle—A dry fruit produced from a simple pistil and dehiscing
along one line of suture.
Fruit—The ripened ovary of a flower.

G
Glabrate—Somewhat glabrous or becoming glabrate.
Glabrous—Smooth, without hairs.
Glandular—Bearing glands or gland-like.
Glaucous—Covered with a bluish or whitish waxy coating; a bloom.
Globose—Ball-like or nearly so.
Globular—Ball-like.

H
Habitat—Site or place of growth.
Hardwood—A collective term for broad-leaved trees, the wood of
which may or may not be dense.
Heartwood—The physiologically dead, central, usually darker
colored portion of the tree trunk.
Hybrid—A crossbreed of two species.

I
Increment—Growth; increase.
Incised—Divided into lobes separated by narrow or acute sinuses
which extend halfway or more to midrib.
Indehiscent—Applied to fruits that do not split open to discharge
the seeds, remaining closed at maturity.
Indigenous—Applied to plants that are native to a certain
locality. Not introduced.
Intolerant—Not shade enduring. Requiring sunlight.
Involucre—A cluster of bracts subtending a flower.

L
Lamina—The blade or flattened portion of a leaf.
Lanceolate—Shaped like a lance; several times longer than wide,
and growing to a point.
Lateral—Situated on the side, as the buds along the side of the
twig.
Leaflets—One of the small blades or divisions of a compound leaf.
Leaf-scar—The scar left after a leaf falls.
Lenticel—A corky growth on young or sometimes older bark, which
admits air to the interior of the twig or branch.
Linear—Line-like, long and narrow, with parallel edges.
Lobed—Said of leaves that have the margins more or less cut or
divided.