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Palmately compound leaf of hemp. A leaflet (occasionally called foliole) in botany is a leaf-like part of a compound leaf. [1] Though it resembles an entire leaf, a leaflet is not borne on a main plant stem or branch, as a leaf is, but rather on a petiole or a branch of the leaf. [2]
Compound leaves may be pinnate with pinnae (leaflets) on both sides of a rachis (axis), or may be palmate with multiple leaflets arising from a single point. [1] Leaf structure is described by several terms that include: Bipinnate leaf anatomy with labels showing alternative usages A ternate compound leaf with a petiole but no rachis (or rachillae)
Composed of several parts, e.g. a leaf composed of multiple leaflet s, a gynoecium composed of multiple carpel s, or an inflorescence made up of multiple smaller inflorescences. compound palmate Having leaflet s that radiate from a central point (usually at the top of a petiole), like spread-out fingers radiating from the palm of a hand ...
Petiole – a leaf stalk supporting a blade and attaching to a stem at a node. Petiolule - the leaf stalk of a leaflet. Pulvinus – the swollen base of a petiole or petiolule, usually involved in leaf movements and leaf orientation. Rachilla – a secondary axis of a multiply compound leaf. Rachis – main axis of a pinnately compound leaf.
paripinnate: pinnately compound leaves in which leaflets are borne in pairs along the rachis without a single terminal leaflet; also called "even-pinnate". imparipinnate: pinnately compound leaves in which there is a lone terminal leaflet rather than a terminal pair of leaflets; also called "odd-pinnate".
Some fronds are not pinnately compound (or simple), but may be palmate, costapalmate, or bifurcate. There is a spectrum from costapalmate to palmate. Costapalmate fronds are shaped like the palm of a hand and have a short midrib or costa. Palmate fronds are also shaped like the palm of the hand, but all ribs or leaflets arise from a central area.
The central stem is green or reddish-purple, usually glaucus but can be slightly pubescent. The alternate leaves are ternately compound. The primary compound leaves are pinnately compound. The leaflets are rounded at the base and are either unlobed or with two to three lobes toward the outer edges.
The leaves are palmately compound, composed of five leaflets (rarely three leaflets, particularly on younger vines, and sometimes seven) joined from a central point on the leafstalk, and range from 3 to 20 cm (1 to 8 in) (rarely to 30 cm or 12 in) across. The leaflets have a toothed margin. Seedlings have heart-shaped cotyledon leaves.