Their definitions refer to the following image. Looks like you’ve clipped this slide to already. There are three basic types of leaf arrangements found in trees and shrubs: alternate, opposite, and whorled. Biologydictionary.net Editors. The upper and lower epidermis vary slightly. Types of leaf *According to blade 1. Below are several types of leaf cell, and the functions they serve. These cells are not neatly packed into rows like the palisade cells. Retrieved from https://biologydictionary.net/leaf-cell/. College of Education In a simple leaf, such as the banana leaf, the blade is completely undivided. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. One such clue is the leaf arrangement on the stem, which is formally known as phyllotaxy in botany. It is a single leaf with undivided leaflets that are directly attached to the stem. In a compound leaf, the midrib of the leaf is branched into different leaflets and is connected by a single petiole. 5) Specialized and unusual leaves – Leaves of insect-eating plants such as pitcher plant and venus flytrap. Based on the types of leaf veins and their arrangement in the lamina, compound leaves are further classified into two types: a) Palmately compound leaf Biologydictionary.net, August 24, 2018. https://biologydictionary.net/leaf-cell/. 69). The lower epidermis, on the other hand, is not responsible for protecting the plant from the harmful rays of sunlight. McMahon, M. J., Kofranek, A. M., & Rubatzky, V. E. (2011). 12/17/2013 It is always attached to a twig by its stem or the petiole. Hi there! These are given below. Guard cells, as they are called, react to various condition inside and outside of the leaf, an open and close accordingly. Based on the number of leaflets, the palmately compound leaf is categorized into the following types: i) unifoliate – one leaflet, ii) bifoliate  – two leaflets, iii) trifoliate – three leaflets, iv) quadrifoliate – four leaflets and, v) multifoliate – five or more leaflets. Types of leaf According to veins Parallel- veined leaves: the veins run at the same distance to other like in canes. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. A leaf that is composed of multiple leaflets that are attached to the midvein, and having their own stalk. Rather, they form networks around bundles of vascular cells, and transport materials to and from the bundles. A leaf that is composed of multiple leaflets that are attached to the midvein, and having their own stalk. In a compound leaf, the leaf blade is completely divided, … These cells are absolutely packed with chlorophyll, and simply work their hardest to pump out as much sugar as they can. See our User Agreement and Privacy Policy. Examples: Azadirachta indica (unipinnate), Mimosa pudica (bipinnate) and, Moringa oleifera (tripinnate). University of Salahaddin They form a protective layer over the leaf. Now customize the name of a clipboard to store your clips. Required fields are marked *. (A) Pinnately Compound Leaf: Depending on the number of times the leaflet is attached to the midrib, pinnately compound leaves are categorized into the following types: i) unipinnate – single compound leaf attached to the midrib in an opposite fashion, ii) bipinnate – single leaflets of the unipinnate leaf gets replaced with unipinnate leaves and, iii) tripinnate – single leaflets of the unipinnate leaf gets replaced with bipinnate leaves.