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Leaves
Functions and Terminology of leaves
43
Agriculture
Undergraduate 3
01/22/2014

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Term
Photosynthesis
Definition
Light absorption is facilitaed by increasing the surface area available
Term
Maximize CO2 Uptake and retention
Definition
Stomata allow diffusion of atmospheric CO2 into plant tissues
Term
Minimize water-gas loss
Definition
Stomata in epidermis regulate exposure of inner tissue to the environment
Term
Prey capture
Definition
Plants in nutrient poor soils have developed modified leaves to trap and digest insects
Term
Vegitative Propagation
Definition
Tiny plants or plantlets grow from the leaves of certian plants
Term
Support
Definition
Leaves modified into spines or tendrils may function to anchor stems in climbing plants
Term
Abaxial surface
Definition
Facing away from the stem axis, such as the underside of a leaf
Term
Acute
Definition
Terminating in a point of less than 90 degrees
Term
Adaxial surface
Definition
Facing towards the stem axis, such as the upper side of a leaf
Term
Alternate
Definition
Leaf arrangement with one leaf per node, alternating from one side of the stem to the other
Term
Blade
Definition
Flat expanded photosynthetic portion of a leaf (also known as lamina)
Term
Compound
Definition
Leaf divided into two or more distinct segments or leaflets
Term
Crenate
Definition
Leaf margin characterized by rounded teeth or appearing scalloped
Term
Dentate
Definition
Leaf margin characterized by rounded teeth at right angels to the line of the margin
Term
Elliptic
Definition
Leaf shape where the middle is wider than the base and apex. Oval in shape
Term
Entire
Definition
Leaf margin that is toothed, with the teeth at right angles to the line of the margin
Term
Heterophylly
Definition
Situation where leaves with distinctive or different shapes occur on the same plant
Term
Leaf
Definition
Lateral outgrowht at nodes of setm, usualy with a stalk and expanded flat part for photosynthesis
Term
Lobed
Definition
Leaf margin characterized by two to many large, rounded or sharp projections
Term
Midrib
Definition
The central and principal vein of a leaf, usually seen as a contiuation of the petiole
Term
Oblong
Definition
Leaf shape where the edges are more or less parallel-sided
Term
Obovate
Definition
Leaf shape where the apex of the blade is broader than the base
Term
Obtuse
Definition
Blunt. Terminated in an angle that is greater than 90 degrees
Term
Opposite
Definition
Leaf arrangement where two leaves arise from the stem at opposite sides of the same node
Term
Ovate
Definition
Leaf shape where the base of the balde is broader than the apex
Term
Palmate Venation
Definition
Arrangement of three or more major veins from or near the base of the blade
Term
Palmately compound
Definition
Compound leaf with more than three leaflets extending out form a common point like the fingers on the palm of a hand
Term
Parallel venation
Definition
Arrangement where major veins are more or less parallel to the midrib or leaf edge
Term
Peltate
Definition
Leaf witht he petiole attached at the center rather than at the edge
Term
Petiole
Definition
Stalk or a leaf (some leaves are sessile, arising directly form the stem without petioles)
Term
Petiolule
Definition
Stalk of a leaflet
Term
Pinnate venation
Definition
Arrangement of veins from either side of the midrib like the pinnae of a feather
Term
Pinnately compound
Definition
Compound leaf with more than three leaflets arranged in two rows from a central axis or rachis like the pinnae of a feather
Term
Plinervy venation
Definition
Palmate venation with 3 primary veins diverging from near the base
Term
Pulvinus
Definition
Enlarged portion of the petiole base or aoex (or both), that functions in leaf movement
Term
Reticulate venation
Definition
An arrangement of veins forming a net-like pattern (also called netted venation)
Term
Rotate venation
Definition
Arrangement where major veins project out from center like the spokes of a wheel
Term
Serrate
Definition
Leaf margin that is saw-toothed with the teeth pointing forward towards the apex
Term
Simple
Definition
Leaf with a single blade, not divided into leaflets
Term
Stipule
Definition
Typically leafy appendage occurring on the stem at the base of a petiole, often in pairs
Term
Trifoliate
Definition
Compound leaf with three leaflets
Term
Unifoliate
Definition
Compound leaf with one leaflet, usually with a joint between the blade and petiole
Term
Whorled
Definition

Leaf arrangement where three or more leaves arise fromt he same node circling the stem

 

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