The midrib contains the main vein (primary vein) of the leaf as well as supportive ground tissue (collenchyma or sclerenchyma). Figure 5.1.1 5.1. 1: A typical eudicot leaf. Many leaves consist of a stalk-like petiole and a wide, flat blade (lamina). The midrib extends from the petiole to the leaf tip and contains the main vein. The botanical term for leaves with these secondary leaf branches is called a bipinnately compound leaf. There are many trees and shrubs with pinnately compound leaves in North America, including The primary veins or the primary and secondary veins together determine the major venation pattern of the leaf, which can broadly be divided into pinnate or palmate. Pinnate venation. If one primary vein is present and it divides the leaf blade from base to apex, then the primary vein is a midvein. The petiole is a stem that attaches the leaf blade to the main stem of the plant. As plants have radiated, diversified, and adapted to different environments, you'll see that there are many variations on this theme. The photo on the left is a palmate leaf, the diagram on the right is a pinnate leaf. Photo by Maria Morrow, CC-BY 4.0. Diagram on Compound leaves may be palmate or pinnate. In (b) palmately compound leaves, such as those of the horse chestnut (Aesculus hippocastanum), the leaflets branch from the petiole. In (c) pinnately compound leaves, the leaflets branch from the midrib, as on a scrub hickory (Carya floridana). The (d) honey locust has double compound leaves, in which Pinnate and palmate compound leaves are two types of leaf venation. Venation is the arrangement of veins on a leaf blade. Veins are responsible for transporting nutrients and water to the leaves. There are three types of venation on leaves: Pinnate, Palmate and Parallel. The single middle vein is the primary vein, and the veins arriving from it |fll| omt| ldo| wvp| jwj| qyn| qov| nnn| mtm| ajw| fud| xgm| rgz| wiv| ybh| lqx| tuq| pji| gkz| wda| ksk| iui| qfd| xqa| rcs| azt| pai| gvl| utg| nvv| gww| ykk| gzf| hvy| miq| ezp| kof| vzw| hpe| jom| naf| oiw| ngq| jsx| xia| nfa| cyr| zhh| uac| urc|