One (leaf or bud) at a node; placed singly at different heights on the stem.


The expanded part of a leaf; the leaf excluding the petiole.

Chambered pith

Pith in transverse plates with air cavities between them.

Compound leaves Those in which the blade consists of two or more separate parts (leaflets).
Deciduous Falling off in autumn or before.
Entire Having a continuous unbroken margin, not toothed, notched, or divided.
Lanceolate Several times longer than wide, broadest near the base and narrowed to the apex.
Leaflet One part of a compound leaf.
Leaf scar A scar left on the twig when a leaf falls.
Linear Long and narrow with parallel margins; line-shaped.
Lobed Divided into segments about halfway to the middle; segments are larger than teeth.
Margin The edge of a leaf.
Midrib The main or central vein of a leaf or leaflet or leaf-like part, a continuation of the petiole.
Node A joint or place where leaves are attached to a stem.
Oblique (leaves) Having unequal sides or a base with sides of unequal lengths.
Opposite Two (leaves or buds) at a node, on opposite sides of an axis.
Ovate Of the shape of a longitudinal section through a chicken egg, with the broad end toward the base.
Palmate Radiating fan-like from approximately one point.
Persistent Remaining attached; leaves not all falling off at the same time.
Pinnate Arranged feather-like on each side of a common axis.
Serrate Having sharp teeth pointing forward, saw-toothed.
Simple leaves Those in which the blade is all in one piece; may be lobed or cleft but not divided all the way to the midrib.
Spur A short, slowly grown branchlet.
Terminal bud The bud formed at the tip of a twig.
Thorn A modified stem or branch with a sharp point.
Truncate Ending abruptly as if cut off transversely.


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