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Related article: in simple leaves such as many of the Mosses.
Leaf Venation. Furcate or Forked Venation is characteristic of
Parallel Venation is typical of the Monocotyledons, as Palms,
Lilies, Grasses, etc.
Reticulate or Netted Veins characterize the Dicotyledons, as the
Poplar or Oak. The primary veins in Buy Buspirone Online these are generally pinnate while
the secondary ones and their branches are arranged in netted fashion.
Pinni-veined or Feathered-veined leaves consist of a mid- vein with
lateral veinlets extending from mid-vein to margin at frequent
intervals and in a regular manner. Example: Calla.
Palmately Veined leaves consist of a number of veins of nearly the
same size, radiating from petiole to margin. Example: Maple leaf.
Veins are said to be anastomosing when they subdivide and join
each other, as the veins near the margin of Eucalyptus leaves.
Leaf Insertion. The point of attachment of the leaf to the stem is
called the insertion. A leaf is:
Radical, when inserted upon an underground stem.
Cauline, when upon an aerial stem.
Ramal, when attached directly to a branch.
When the base of a" sessile leaf is extended completely around the
stem it is perfoliate, the stem appearing to pass through the blade.
Example: Uvularia perfoliata or Mealy Bellwort.
FIG. 83. Leaf outlines: Linear (i); lanceolate (2); oblong (3); elliptical (4):
ovate-lanceolate (5); oblanceolate (6); spatulate (7); obovate-lanceolate (8):
orbicular (9); reniform (10); cuneate (n).
PLANT ORGANS AND ORGANISMS
When a sessile leaf surrounds the stem more or less at the base,
it is called clasping or amplexicaul. Example: Buy Buspirone Online Poppy (Papaver
When the bases of two opposite leaves are so united as to form
one piece, they are called connate-perfoliate, as Eupatorium perfolia-
tum or Boneset.
Leaves are called equitant when they are all radical and succes-
sively folded Buy Buspirone Online on each other toward their bases, as in Iris sp.
The Forms of Leaves. Simple leaves are those having a single
blade, either sessile or petiolate.
Compound leaves are divided into two or more distinct subdivi-
sions called leaflets, which may be either sessile or petiolate.
Simple leaves and the separate blades of compound leaves are de-
scribed as to general outline, apex, base, marginal indentations, sur-
face and texture.
(a) General Outline (form viewed as Buy Buspirone Online a whole without regard to
indentations of margin). Dependent upon kind of venation.
When the lower veins are Buy Buspirone Online longer and larger than the others, the
leaf is Ovate, or Egg-shaped. Parallel-veined leaves are usually
linear, long and narrow of nearly equal breadth throughout
(Linaria), or lanceolate, like the linear with the exception that the
broadest part is a little below the center. Example: Long
Elliptical, somewhat longer than wide, with rounded ends and
sides. Example: Leaf of Pear.
Oblong, when longer than broad, margins parallel. Example:
Inequilateral, margin longer on one side than the other, as the
Hamamelis, Elm and Linden.
Orbicular, circular in shape. Example: Nasturtium.
Peltate, or shield-shaped, having the petiole inserted at the center
of the lower surface of the lamina. Example: Podophyllum.
Filiform, or thread-like, very long and narrow, as Asparagus leaves.
Ovate, broadly elliptical. Example: Boldo. Obovate, reversely
ovate. Examples: Short Buchu and Menyanthes.
Oblanceolate, reversely lanceolate. Example: Chimaphila.
Cuneate, shaped like a wedge with the point backward.
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