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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.
- 3.4.1: External Structure
Venation. Leaf veins are vascular bundles coming to the leaf...
- 13.1: Leaf Parts and Arrangement
The leaf blade is (usually) the flat, photosynthetic part of...
- 3.4.1: External Structure
Venation. Leaf veins are vascular bundles coming to the leaf from stem. The arrangement of veins in a leaf is called the venation pattern. Frequently, there is one or more main vein (primary vein) and secondary veins that branch from it. Tertiary veins branch from secondary veins (F igure \(\PageIndex{11}\)).
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.
2 cze 2020 · Feature image: Ginkgo (Ginkgo biloba) leaves that were shed from trees in the fall. Ginkgo leaves have dichotomous venation, or a pattern of venation in which the veins fork one or more times. Credit: E.J. Hermsen (DEAL).
28 wrz 2021 · Higher-order veins & areoles. Leaves may have vein orders above tertiary venation, including quaternary veins (fourth-order), quinternary veins (fifth-order), and even higher orders. Like tertiary veins, these veins fill in the spaces between the major veins of the leaf.
