The Red Fir Forest

Leaf Arrangement Terms

Leaf Arrangement

Alternate

Alternate leaves are arranged singely at different points along a stem.

Rein Orchid leaves are alternate.

Opposite

Leaves and may opposite each other along the stem.

Lewis Monkeyflower, Elephanthead, and Mountain Pride leaves are opposite.

Palmate

Palmate leaves resemble a hand with the fingers spread. They have lobes radiating from a common point.

The Brewer's lupine and spur lupine have a palmate leaf pattern.

Whorled

A Whorl is a collection of three or more similar organs projecting from a node.

Whorled Penstemon, blossoms are whorled about a single node.

Pinnate

Leaflets arranged along the long axis of the leaf.

Pinnately form in pairs along a central stalklike rachis.

Elephanthead leaves are pinnate.

Bipinnate

Twice pinnate or bipinnate means the primary leaflets are being again divided into secondary leaflets.

Yarrow leaves are bipinnate.