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.
Helianthus decapetalus.
Composite Family. Aug. - Sept.
A plant 2 - 5 feet tall, found in moist woods, beside streams. Eastern United States to Minnesota, Missouri and southward.
Yellow, 2 - 3 inches broad, rays about 10.
Egg-shaped, pointed, opposite, smooth or slightly rough. Plant stem rough above; smooth below, 2 - 5 feet tall.

Thin-leaved Sunflower.
 
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