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:
Plant
  special groups
   legumes
   dicots
  armature
   unarmed
   armed
  sap
   latex absent (sap clear)
   latex present
  leaves/twigs aromatic when crushed
   without marked odor
   clearly odiferous
Leaves
  arrangement/phyllotaxy
   alternate
   opposite
   whorled
   fascicled/clustered along stem
  blade division
   all simple
   deeply lobed or divided
   some or all fully compound
  leaf persistence
   deciduous
   persistent (evergreen)
  stipules
   stipules absent
   stipules or their scars present
  leaf (leaflet) margin
   entire
   toothed
   lobed
Inflorescence
  flowering season - upper Midwest
   spring
   summer
Flower
  ovaries/pistils per flower
   1
   2-5
   more than 5
Fruit or Cone
  cone (strobilus)
   absent
   present & non-woody
   present & woody
  fruit consistency at maturity
   dry/leathery
   fleshy

IURTP: tree list

Michael Chitwood
Species Count: 65

Altingiaceae

Annonaceae

Aquifoliaceae

Betulaceae

Cannabaceae

Cornaceae

Cupressaceae

Ebenaceae

Fabaceae

Fagaceae

Juglandaceae

Lauraceae

Magnoliaceae

Malvaceae

Moraceae

Nyssaceae

Oleaceae

Paulowniaceae

Pinaceae

Platanaceae

Rosaceae

Salicaceae

Sapindaceae

Simaroubaceae

Ulmaceae