Field Guide

Trees, Shrubs and Woody Vines

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Illustration of common prickly ash leaves, flowers, fruits
Species Types
Scientific Name
Zanthoxylum americanum
Common prickly ash is a thicket-forming shrub or small tree. Its compound leaves resemble of those of ash trees, but it’s in a different family. Pairs of stout, curved prickles occur at each node. Scattered statewide, but less common in the Ozarks.
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About Trees, Shrubs and Woody Vines in Missouri

There are no sharp dividing lines between trees, shrubs, and woody vines, or even between woody and nonwoody plants. “Wood” is a type of tissue made of cellulose and lignin that many plants develop as they mature — whether they are “woody” or not. Trees are woody plants over 13 feet tall with a single trunk. Shrubs are less than 13 feet tall, with multiple stems. Vines require support or else sprawl over the ground.