Silphium, Rosin-weed
A coarse North American perennial herb with a loose panicle of yellow flower-heads. Only the ray flowers are fertile. Rough, toothed leaves extend up the tall stem. Broad bracts around the flower-head are bent outward and downward. Blooms June-Sept.
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| Format: | Electronic |
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Auburn University Libraries
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| Online Access: | http://content.lib.auburn.edu/u?/flora,28 |