This section is from the book "Wild Flowers Every Child Should Know", by Frederic William Stack. Also available from Amazon: Wild flowers every child should know.
This slender, wand-like Hawkweed grows from one to three feet in height. The stem is stiff, hairy, and sometimes nearly leafless. The long oval basal leaves are either entire or toothed, and are usually narrowed into short stems. The upper leaves are oblong or oval, and all are rough, hairy, and strongly ribbed. The stalk forks at the top to receive the numerous yellow, Dandelion-like flowers. The flowers open only in the bright sun, and wilt immediately when plucked. They are found from July to September, in dry locations, from Florida and Louisiana to Massachusetts, Illinois and Ontario.

LEAF AND ROOT FORMS.
 
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