NAME: ROSIN WEED
Silphium integrifolium
DESCRIPTION:
Leaf: Opposite, ovate-lancelate, acuminate, toothed
and rough to the touch measuring 7 to 15 cm long and 2.5 to 5 cm wide.
Flower: Yellow heads up to 5 cm broad, composed of both disk and ray
flowers, numbering up to 25. Sunflower-like in appearance.
Present Early June to early October.
Stem: 2-4 feet in height and rough.
DISCUSSION:
A native, warm season perennial belonging to the Compositae
family.
DISTRIBUTION:
Common in the prairies of Illinois. Also ranges from Wisconsin south
to Alabama and Kansas.
IMAGES:
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MAP:
COPYRIGHT:
© Copyright 2002, L&T Natural Images
and Madsion Jr. High, all rights reserved. Contact information: email at lcwik@naperville203.org or tcoutts@naperville203.org
REFERENCES:
Mohlenbroch, Robert H., and John W. Voigt. Prairie Pants of
Illinois.
Springfield, Illinois: Illinois Department of Natural Resources, 1985.
Young, Dick. Kane County Wild Plants and Natural Areas. 2nd
ed. Geneva, Il:
Kane County Illinois Forest Preserve District, 1994.
Want more images of these and many other Prairie
Plants? Check out this site! Fermilabs "Particles
and Prairie" site.
Interested in restoring a prairie parcel of your own? Try this
one! Prairie
Parcel Restoration.
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