Studying: Leaf Parts

Yeah, that’s right. I am studying for finals still. You’re welcome. Enjoy the cool pictures with the vocabulary.

Leaf parts

  • Blade (Lamina)- the flattened part of the leaf
  • Petiole- the stalk supporting the blade
  • Stipules- parts located at the base of a leaf that joins them stem

Arrangement or Phyllotaxy of the leaf

  • Alternate- one leaf per node
  • Opposite- two leaves per node
  • Whorled- more than two leaves per node

Composition of the leaf

  • Simple- blade has one segment
  • Compound- blade is divided and has more than one segment
  • Leaflets- separate segments of a compound leaf
  • Pinnately Compound- leaflets that are along a primary rachis
  • Bipinnately Compound- leaflets that have been divided twice
  • Tripinnately Compound- leaflets that have been divided three times
  • Palmately Compound- leaflets radiate from a central point

Shape of the Leaf

  • Elliptic- leaf blade is widest in the middle
    • Football shaped
  • Ovate- the leaf is widest at or near the base
    • Egg shaped
  • Lanceolate- leaf is several times longer than wide but is widest near it’s base
    • Lance shaped
  • Obovate- leaf blade is widest near the apex
    • Reverse egg shape

Margin

  • The Margin is the side of the leaf
    • Entire- smooth margin on the leaf
    • Dentate- toothed margin on the leaf
    • Serrate- saw toothed

Apex

  • Acute- apex is from the straight sides
  • Acuminate- base is formed from concave-ly curved sides
  • Obtuse- with a rounded apex

Base

  • Acute- base is formed from straight sides
  • Acuminate- base is formed from concave-ly curved sides
  • Obtuse- rounded apex
  • Oblique- asymmetrical

Until next time

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