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Leaf Morphology I

Leaf Morphology - parts and types of leaves

TermDefinition
What are the 3 parts of a leaf? Blade, Petiole, and Stipule
Blade broad, expanded part of a leaf
Petiole Leaf stalk
Stipule One of a pair of leaf-like appendages often found at the base of the petiole
Sessile Leaves attached directly to stem
Leaf arrangement - alternate 1 leaf borne per node
Leaf arrangement - opposite 2 leaves borne per node, leaves opposite each other on twig
Leaf arrangement - decussate each adjacent pair of leaves is rotated (around twig) about 90°
Leaf arrangement - whorled or verticillate 3 or more leaves per node
Leaf arrangement: Dwarf shoots Leaves crowed on shoots growing out from the side of a stem. Dwarf = less than 1" Ex: apples, conifers
Leaf arrangement: pine shoots Leaves crowed on shoots growing out from the side of a stem. Pine = greater than 1" Ex: Oaks
Leaf type: Simple undivided or uninterrupted leaf blade.
Simple leaf characteristics Lobed or pinnatifid (lobes that reaches near the midrib)
Compound leave definition leaf blade is divided into segments
Compound leaf part: Leaflet photosynthetic division of a compound leaf
Compound leaf part: Petiolule stalk of a leaflet
Compound leaf part: Rachis main axis of a compound leaf or inflorescence from which leaflets or flowers are borne
Compound Leaf Types—Pinnate Pinnately compound compound leaf with leaflets arranged on opposite sides of one elongated axis
Compound Leaf Types—Pinnate Decompound Term used for leaves more than once pinnately compound
Compound Leaf Types—Pinnate Palmately compound compound leaf with all leaflets arranged at the apex of the petiole
How can you tell leaf type? Everything beyond the bud is ONE leaf.
Created by: baronesscj
 

 



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