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Common Groundsel
Senecio sylvaticus
not native
Grows in disturbed areas. This low, branched annual has pinnately
divided and toothed leaves, the lower ones with stalks, the upper
ones without. The heads are numerous and small, with no rays
and minute yellow disc flowers.
The involucral bracts are uniform in length and have black
tips.
This weed was introduced from Eurasia and has now spread over
much of the Northwest. It is extremely prolific, continually
producing large numbers of seeds during the growing season and
becoming especially troublesome in moist cultivated fields and
gardens.
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