This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
This species has a stronger stem than the last, with many hooked bristles by which it climbs over bushes. The leaves, whorled, 4 to 6 upon stem and branches, are oval or lance-shaped. They often terminate in a prickle. Flower-stems forked 2 or 3 times.
Banks of streams in all the Eastern States.
 
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