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Leaves By: Becky McGuire
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Function make food used by plants for growth & reproduction
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Parts Dicots a. blade: broad, thin part of leaf
b. petiole: thin stem attaching leaf to stem 1. sessile: leaves with no petiole c. midrib: large, central vein d. margin: edge of leaf
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Parts Dicots, continued
E. secondary vein: branches from main vein F. tip: top of leaf G. base: bottom of leaf
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Diagram of a Dicot Leaf Tip Midrib Blade Petiole Base Margin Secondary
Vein Midrib Blade Petiole Base Margin
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Monocots a. sheath: portion of leaf blade surrounding stem
b. ligule: “collar” extension of sheath curving around stem auricles: appendages that surround stem at junction of blade and sheath
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Diagram of a Monocot Leaf
Stem Ligule Auricles Sheath
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WHERE WILL YOU EVER USE THIS?
For identification of weeds and plants for fertilizer, pesticides, etc.
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Leaf Characteristics Simple
a. one blade per leaf ex: grass, oak, apple
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Compound a. several leaflets ex: sumac, locust
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identification shape, margin, tip, base (see handouts)
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venation: arrangement of veins in a leaf
1. parallel: extend from base to tip of leaf in parallel lines ex. Grasses/monocots 2. dichotomous: forked veins, begin at base and go out from central point to tips ex. Ferns, ginko 3. pinnate: secondary veins extend from midrib ex. Poplar 4. palmate: principal veins extend from petiole ex. Maple, sweetgum
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arrangement on stem 1. alternate: leaves occur at alternate spots on stem; single leaf at each node a. oak, beech 2. opposite: leaves occur two at a node on opposite sides of stem a. maple, ash, dogwood (MAD; only 3) 3. whorled: 3 or more leaves at each node
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