Cedarville University

http://www.cedarville.edu/academics/sciencemath/silvius/botany/leaf1.html


Cedarville University

(1) Leaves Needle-Shaped or Scalelike


  • (2) Leaves in Clusters of Two or More Needles
  • Five delicate needles per cluster
    Needles two per cluster, bluish green

  • (2) Leaves Not in Clusters
    • (3) Leaves Needle-Like or Strap-Shaped
    • Flattened needles ot two types; light stripes on under-surface
      Deep green needles above, pale but not while-striped on under surface; red arils when mature
      Bluish-green needles spirally arranged on twig
      Green to dark green needles spirally arranged on twig
    • (3) Leaves Scale-Like
    • Flat, yellow-green, scalelike leaves appressed to stem; cones with scales
      Flat, scalelike leaves appressed to stem; or, sharp needle shaped leaves in young trees

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