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  .  
Tree  
  .  
Shrub  
  .  
Vine  
  .  
Fern
(non-flowering
plant)
 
  .  
Wildflower  
  .  
Grass, Sedge
and related
 
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1. Trees, shrubs and some types of vines have woody trunks or stems. Generally,
trees are capable of growing taller than 25 feet, though there a few species that don't grow much taller than 25 feet, such as mountain maple (Acer spicatum) and striped maple (Acer pensylvanicum). Those species are often referred to as "understory trees". Common buckthorn (Rhamnus cathartica) is another understory tree. Most roses, raspberries and blackberries are treated as shrubs in this key. Search for them with the shrubs.

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2. Several low-growing species appear to be herbaceous (non-woody) wildflowers, but are considered by botanists to be "sub-shrubs" because their stems have woody bases. These include, but are not limited to, wild sarsaparilla (Aralia nudicaulis) and trailing arbutus (Epigaea repens). In this key, search for these together with herbaceous wildflowers.

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3. Both woody and herbaceous (non-woody) vines are treated in the same section of this key.

 

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