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Common Crupina Asteraceae
(=Compositae), the aster family
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Background
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 Common crupina is a native of the eastern Mediterranean
region. Though it was introduced to North America (and first discovered in
Idaho) less than 30 years ago, it has spread to over 60,000 acres in Idaho
and moved into Oregon, Washington, and California. It is usually found on
dry south-facing slopes and pastures. It spreads by seed.
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Description
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 Common crupina is a winter
annual that grows up to 4
feet in height. Cotyledons (or seed leaves) exhibit a bright purple
midrib.
Leaves are simple and up to 6 inches long,
entire near the base of the
plant, lobed on the lower stem, and finely
dissected on the upper stem. Up
to 5 narrowly cylindric seed heads are borne on branch tips in midsummer.
Flowers are pink to purple and are followed by dark seeds about he size of a
kernel of wheat with a ring of black, bristly hairs at the point of
attachment.
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Distribution
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 Common crupina is found exclusively in the Pacific
Northwest and in central Idaho counties. |
Control
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No biological control agents are available for common crupina but herbicides are available that can control this weed. |
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© 1999 University of Idaho:
Text and photographs for these pages from Idaho's Noxious Weeds, by
Robert H. Callihan and Timothy W. Miller (revised by Don W. Morishita
and Larry W. Lass).
Please contact: Ag Publishing, University of Idaho, Moscow,
Idaho 83844-2240; 208 882-7982 visit the Resources for Idaho website at
http://info.ag.uidaho.edu, for more information about this or other
publications.
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