Trees, Shrubs and Woody Vines
Unlike its cousin poison ivy, fragrant sumac is a peasant, nontoxic plant. Note the middle leaflet of its "leaves of three": On fragrant sumac, there is no (or at most a very short) leaf stalk on that middle leaflet. Also, fragrant sumac has hairy, reddish fruits (not waxy whitish ones).
Poison ivy is a toxic plant that contains an oil in all its parts that, if you come into contact with it, can cause an intense skin reaction. Learn to recognize it, and sidestep it on your outings.
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.