This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Galium asprellum. Madder Family. June - Aug.
A plant 2 - 4 feet tall. Found in rich, moist ground. Eastern half of United States and Canada.
White, tiny, in airy clusters. Flower stems 2 - 3 times forked.
In whorls of 6 on main stems, prickly-rough on edge and rib. Plant stems rough backwards with hooked prickles.

Rough Bedstraw.
 
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