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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)
The two main classes of compound leaf morphology are palmate and pinnate. For example, a hemp plant has palmate compound leaves, whereas some species of Acacia have pinnate leaves. The ultimate free division (or leaflet) of a compound leaf, or a pinnate subdivision of a multipinnate leaf is called a pinnule or pinnula.
Leaves are sometimes lauroid (resembling Laurus) and are simple to compound; when compound, they are ternate, pinnate, or palmate. [citation needed] Araliaceae are found in the pluvial montane forest, very humid montane forest, and humid lowland river forest regions. They are also present in laurel forest, cloud forest, and warm, humid habitats.
The middle vein of a compound leaf or a frond, when it is present, is called a rachis. Palmately compound The leaflets all have a common point of attachment at the end of the petiole, radiating like fingers of a hand; for example, Cannabis (hemp) and Aesculus (buckeyes). Pinnately compound Leaflets are arranged either side of the main axis, or ...
Palms have large, evergreen leaves that are either palmately ('fan-leaved') or pinnately ('feather-leaved') compound and spirally arranged at the top of the stem. The leaves have a tubular sheath at the base that usually splits open on one side at maturity. [9]
Palmate (palmata) – divided into many lobes. Pedate (pedata) – palmate, with cleft lobes. Peltate (peltata) – rounded, stem underneath. Perfoliate (perfoliata) – stem through the leaves. Pinnate (pinnata) – two rows of leaflets. odd-pinnate – pinnate with a terminal leaflet. paripinnate, even-pinnate – pinnate lacking a terminal ...
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".
2. (of leaves) A type of vernation in which one leaf is rolled up inside another. 3. A type of vernation of two leaves at a node, in which one half of each leaf is exposed and the other half is wrapped inside the other leaf. corcle A plant embryo, plumule, or plumule plus radicle. cordate