My daughter is taking a summer class at the local college on Minnesota ecology and the grounds are thick with poison ivy. We live a block away so I'm rather interested.
I found this on Wikipedia—
The plants can grow as a shrub up to about 4 foot tall, as a ground cover 4–10 inches high, or as a climbing vine on various supports. Older vines on substantial supports send out lateral branches that may at first be mistaken for tree limbs.
The compound leaves of poison ivy consist of three pointed leaflets; the middle leaflet has a much longer stalk than the two side ones. The leaflet edges can be smooth or toothed but are rarely lobed. The leaves vary greatly in size, from 0.31" to 2.16" in length. They are reddish when they emerge in the spring, turn green during the summer, and become various shades of yellow, orange or red in the autumn.
The photos were taken from the Internet, the photographer is unknown.
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