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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)
Leaf Parts: – A complete leaf is composed of a blade, petiole, and stipules, but in many plants one or more might be lacking or highly modified. Blade – see lamina. Lamina – the flat and laterally-expanded portion of a leaf blade. Leaflet – a separate blade, among others, of a compound leaf
English: Top and Right: Staghorn Sumac, Rhus typhina (Compound Leaf) Bottom: Skunk Cabbage, Symplocarpus foetidus (Simple Leaf) 1. Apex 2. Primary Vein 3. Secondary Vein 4. Lamina 5. Leaf Margin 6. Petiole
In most leaves, the primary photosynthetic tissue is the palisade mesophyll and is located on the upper side of the blade or lamina of the leaf, [1] but in some species, including the mature foliage of Eucalyptus, [5] palisade mesophyll is present on both sides and the leaves are said to be isobilateral. The leaf is an integral part of the stem ...
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All the "leaves" in this image are bracts. In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale. Bracts are usually different from foliage leaves; they may be of a different size, color, shape, or texture.
It is known that foliaceous stipules are used like leaves to make energy for the plants. Sometimes stipules protect the next leaf or bud as it grows in then falls off after the leaf unfolds, as with Tulip Poplars. [4] Stipules can be used as climbing tendrils by climbing plants. Spiny stipules can be used to help protect the plant from animals. [8]
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 are common in many plant families and they differ widely in morphology. [3]