hortbot_lesson_plan8 by lanyuehua

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									Leaves


HortBotany
          Leaf morphology
• Arrangement (look for bud)
  • Alternate
     •1 leaf for each node
     • Betula spp., Cercis spp., Quercus
      spp., Gleditsia spp. Ulmus spp.
Leaf morphology
 (arrangement)
          Leaf morphology
• Arrangement (look for bud)
  • Opposite
     •2 leaves for each node
     •Acer spp., Cornus spp., Fraxinus
      spp., Viburnum spp.
Leaf morphology
 (arrangement)
          Leaf morphology
• Arrangement (look for bud)
  • Subopposite
     •2 leaves for each node
     •Lagerstroemia indica
Leaf morphology
 (arrangement)
          Leaf morphology
• Arrangement (look for bud)
  • Whorled
     •3 or more leaves for each node
     •Catalpa spp., Hydrangea spp.,
      Nerium oleander
Leaf morphology
 (arrangement)
           Leaf morphology
• Leaf types
   • Angiosperm
      •Simple
      •Bud in leaf axil of single leaf
      •Acer spp., Betula spp., Cornus
       spp., Quercus spp., Ulmus spp.
   Leaf morphology
(angiosperm leaf types)
           Leaf morphology
• Leaf types
   • Angiosperm
      •Compound
      •Bud in leaf axil of more than one
       leaflet
      •Aesculus spp., Fraxinus spp.,
       Gleditsia spp., Pistacia spp.
   Leaf morphology
(Angiosperm leaf types)
   Leaf morphology
(Angiosperm leaf types)
   Leaf morphology
(Angiosperm leaf types)
   Leaf morphology
(Angiosperm leaf types)
           Leaf morphology
• Leaf types
   • Gymnosperm
      •Needle-like
      •Prickly to touch
      •Juniperus spp.(adult foliage)
   Leaf morphology
(Gymnosperm leaf types)
           Leaf morphology
• Leaf types
   • Gymnosperm
      •Scale-like
      •Overlaps like shingles or fish scales
      •Soft to touch
      •Cupressus spp., Thuja spp.,
       Juniperus spp. (juvenile foliage)
   Leaf morphology
(Gymnosperm leaf types)
           Leaf morphology
• Leaf types
   • Gymnosperm
      •Needle-like
      •Pinus spp.
        •Combined in fascicles of 1, 2, 3,
          4, or 5 needles
   Leaf morphology
(Gymnosperm leaf types)
           Leaf morphology
• Leaf types
   • Gymnosperm
      •Abies spp., Cedrus spp., Picea
       spp., Taxus spp.
        •Singly or in clusters on stem
   Leaf morphology
(Gymnosperm leaf types)




     Spruce Foliage
          Leaf morphology
• Leaf shapes
   • Angiosperm
      •Ovate
          Leaf morphology
• Leaf shapes
   • Angiosperm
      •Obovate
          Leaf morphology
• Leaf shapes
   • Angiosperm
      •Cordate
          Leaf morphology
• Leaf shapes
   • Angiosperm
      •Lanceolate
          Leaf morphology
• Leaf shapes
   • Angiosperm
      •Linear
          Leaf morphology
• Leaf shapes
   • Angiosperm
      •Deltoid
          Leaf morphology
• Leaf margins
   • Angiosperm
      •Entire
          Leaf morphology
• Leaf margins
   • Angiosperm
      •Serrate
          Leaf morphology
• Leaf margins
   • Angiosperm
      •Sinuate
          Leaf morphology
• Leaf margins
   • Angiosperm
      •Lobed
          Leaf morphology
• Leaf margins
   • Angiosperm
      •Crenate
The End

								
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