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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]
Chart illustrating leaf morphology terms The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflets ). [ 1 ]
Leaf morphology: Shape, margin and venation. 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
[4] [5] "Frond" is commonly used to identify a large, compound leaf, but if the term is used botanically to refer to the leaves of ferns and algae it may be applied to smaller and undivided leaves. Fronds have particular terms describing their components. Like all leaves, fronds usually have a stalk connecting them to the main stem.
Zamia furfuracea leaves. The genus comprises deciduous shrubs with aerial or subterranean circular stems, often superficially resembling palms.They produce spirally arranged, pinnate leaves which are pubescent, at least when young, having branched and simple, transparent and coloured hairs.
The leaves are 12–22 cm long, pinnate, with 5–11 leaflets, the girth is 12–34 m wide. Most Pterocarpus species prefer seasonal weather but P. indicus prefer rainforests . The flowers are produced in panicles 6–13 cm long containing a few to numerous flowers; flowering is from February to May in the Philippines, Borneo and the Malay ...
The stems are square in cross-section and may branch near the top. The leaves are pinnate, divided into a few toothed triangular or lance-shaped leaflets usually 6–8 cm (2 + 1 ⁄ 2 –3 in) long, exceptionally up to 12 cm (4 + 1 ⁄ 2 in). The inflorescence is often a solitary flower head, but there may be pairs or arrays of several heads.
[5] [7] [8] On seedlings the leaves are simple but on mature trees they are pinnately compound, [5] and there is a graduation of the leaf morphology as the tree grows (see gallery). Leaves on mature trees reach up to 65 cm (26 in) long with a petiole up to 11 cm (4.3 in) long. [ 5 ]
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