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Identify the main parts of a leaf. Compare petiolate and sessile leaves. Distinguish among alternate, opposite, and whorled phyllotaxes. Compare simple, pinnately compound, and palmately compound leaves. Compare parallel, pinnate, and palmate venation in leaves. Recognize common leaf margins and shapes.
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- 13.1: Leaf Parts and Arrangement
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31 paź 2023 · The arrangement of veins in a leaf is called the venation pattern; monocots have parallel venation, while dicots have reticulate venation. The arrangement of leaves on a stem is known as phyllotaxy; leaves can be classified as either alternate, spiral, opposite, or whorled.
The leaf blade is (usually) the flat, photosynthetic part of the blade. In eudicots, the leaf will have a central midvein (also called the midrib), with smaller veins branching off from there. This type of vein organization is called netted venation. The edge of the blade is the margin.
Leaf venation refers to the patterns the veins follow in the leaf – parallel, netted or obscure. In some cases, you will need to look at the very small veins that run between the main veins in order to identify the type of venation.
18 kwi 2013 · We describe the development and plasticity of leaf venation and its adaptation across environments globally, and a new global data compilation indicating trends relating vein length per unit area to climate, growth form and habitat worldwide.
28 wrz 2021 · Leaves are often described based on their phyllotaxy (arrangement on the stem), whether they are simple or compound, size, major venation pattern (e.g., pinnate or palmate, type of lateral veins), type of margin (edge of the leaf blade), and type of indumentum (type and density of hairs, if present).
Identify the parts of the angiosperm leaf. Describe some of the ways in which leaf parts differ from plant to plant. Recognize the basic patterns of leaf shape and orientation of the veins in the leaves.
