Grass leaves are borne singly at the nodes and, with minor exception, are arranged in two vertical ranks. Leaf Evolution. (11) Lunate—shaped like a half-moon with two pointed basal lobes as in some Adiantum (a fern) and in Passiflora lunata (reversed). (2) Acuminate—when the apex is drawn out into a long tapering tail as in Ficus religiosa (pipul). There is, usually, a middle prominent vein, which is known as the midrib. This is called connate and is found in Swertia chirayita, Canscora diffusa, etc. The pattern of leaf incision depends on the type of venation. The articulation shows that the leaf is not a simple one but compound. The ramifications are called veins and their arrangement is known as vena­tion. For more terms describing other aspects of leaves besides their overall morphology see the leafarticle. This is the type of venation as seen in all common dicotyledons like the mango or any Ficus. The compound leaf again may be pinnate  or palmate. (3) Obtuse—when the apex is broad angled and blunt as in banyan. Learn more. lam•i•na. Neither ethylene nor (2-chloroethyl)phosphonic acid (ethephon) caused the bending of the second leaf lamina, and neither synergized the BR effect. Exponential associations provided good fits for relationships between the moisture meter reading (MMR) and the electrical resistance applied to the electrodes. (c) Wider at the base and narrow towards the apex: (5) Subulate or awl-shaped—long and narrow, tapering gradually from base to apex as in Salsola kali and Isoetes (a pteridophyte). In extreme cases of leaf incision (e.g., date palm or marigold leaf) it seems that the lobes have been completely dissected so that there is no laminar connection between the lobes. In some plants of Umbelliferae   the leaf is highly incised but there is practically no lamina formation so that only green stalks are present. (16) Elliptical—like an ellipse as in Vinca rosea, guava and India-rubber. It bears the weight of the lamina and conducts water and food materials between the stem and leaf. is that lamina is (botany) the flat part of a leaf or leaflet; the blade while blade is (botany) the thin, flat part of a plant leaf, attached to a stem (petiole) the lamina. (9) Bi-crenate—margin toothed and the teeth are again crenate. As nouns the difference between lamina and blade is that lamina is a very thin layer of material while blade is the sharp cutting edge of a knife, chisel, or other tool, a razor blade. Welcome to BiologyDiscussion! In Pisum and Lathyrus   the terminal and other leaflets may be transformed into tendrils. When incision is of a higher order than in tripinnate as in carrot, anise, fennel (Foeniculum vulgare) and other plants of Umbelliferae . As development continues the outgrowths are extended and become slightly plate-like. As liquid moves through the leaf lamina, from entry at the petiole–lamina junction to the sites of evaporation, its flow rate at a given water potential difference depends on the lamina hydraulic conductance (Klamina). This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. A compound leaf is sometimes confused with a twig bearing leaves. The peculiar case of Lemna   has already been discussed. This boundary is required not only for growth in the lateral direction but also for the leaf to increase in length by proximo-distal growth (Johnston et al., 2010). The midrib gives out secondary branch veins resembling the general plan of a feather (hence the name pinnate) and these, in their turn, give rise to the anastomosing veins. (7) Cirrhose—when the mucronate-like apex ends in a fine thread-like structure as in banana. These are called lyrate  leaves. The reticulate type of venation shows two variations; This type of venation may be likened to racemose branching. A leaf (plural leaves) is the principal lateral appendage of the vascular plant stem, usually borne above ground and specialized for photosynthesis.The leaves and stem together form the shoot. This is the case in many aquatic plants as well. The Angiosperm leaf shows two principal types of venation. Results: The device indirectly estimates leaf moisture content using two electrodes applied to the leaf lamina of fresh and stored samples. (14) Spathulate—shaped like a spatula as in Euphorbia nerifolia, Phyla nodiflora or Drosera burmanni. Answer Now and help others. It’s generally broad and flat. There can be no bud terminating a compound leaf, leaflets cannot bear stipules (however, there may be stipels ) or axillary buds. These characteristics of the lamina become important for identification when any­thing special is found. When a tadpole turns into a frog, its tail shrinks and is reabsorbed. These spines may be comparatively small as on the leaves of Argemone mexicana, Pineapple, Agave, Aloe, etc. …have sheathing leaves, usually with blades; but members of a substantial number of genera, including Caustis, Eleocharis, Lepironia, Schoenoplectus, and Trichophorum, may be bladeless or nearly so. Common examples are Portulaca oleracea (Portulacaceae), Basella rubra, Suaeda maritima and Salsola kali of Chenopodiaceae, Aloe and Agaves, Kalanchoe, Sedum acre (stone crop), etc. Disclaimer Copyright, Share Your Knowledge Borne singly at the nodes and, with minor exception, are arranged in two ranks! Provided good fits for relationships between the moisture meter reading ( MMR ) and the resistance. Bi-Crenate—Margin toothed and the electrical resistance applied to the electrodes be transformed into.... In Pisum and Lathyrus the terminal and other allied information submitted by visitors like YOU like... 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