Rosinweed Silphium integrifolium
Description:
The Rosinweed is a native, warm-season perennial belonging to the
Composite, or aster family. It reaches a height up to nearly two meters. It has
a dense, fibrous root system.
Leaf: Its rather small, rough, pointed leaves are
opposite on the stem and attached directly to the stem. They measure from 7 to
15 cm long and 2.5 to 5 cm wide. The leaves are so rough that they cannot be
easily rubbed.
Flower: The yellow heads are up to 5 cm. broad. They
are composed of both disk and ray flowers. The rays are about 0.5 cm. long and
number up to 25.
Blooming months: July – September
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8-20 |
8-20 |
10-13 |
Discussion:
It is named for its resinous sap. Native Americans and settlers chewed
its gummy sap to clean their teeth.
Distribution:
This species is common in the prairies of
Native
or Introduced to
Location:
N41048.677’ W089040.972’
Copyright:
© 2004 Nancy Trainor,
References:
Keller, Carolyn. Prairie Plants of
Ladd, Doug. Tallgrass Prairie Wildflowers, The Nature Conservancy, 1995.
Peterson, Roger Tory. Wildflowers Northeastern/North Central
Mohlenbroch, Robert H., and John W. Voigt. Prairie
Plants of
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