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.
One climbing species should be noticed, escaped from cultivation in New England and found wild in our prairies. It climbs by means of its hooked prickles. Leaflets, generally 3, sometimes 5, serrate but not bristly. Flowers, 2 1/2 inches across, several together, in corymbose clusters, with peduncles.
 
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