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DESCRIPTION:
Common groundsel is a nearly ubiquitous winter or summer annual broadleaf, but can grow all year in coastal areas of California.
Infestations are most troublesome during cool, moist periods. Cotyledons (seed leaves) are elongate,
with a blunt, rounded tip. The first true leaves have shallow teeth; the
third and fourth leaves are more deeply lobed. Groundsel grows up to 60
cm (2 feet) tall.
Leaves are alternate along the stem and are deeply indented. Upper leaves are
attached directly to the stem, but lower leaves have a short stalk. The
green leaflike structures
surrounding the flower cluster have conspicuous black tips that distinguish
groundsel from other weeds in the thistle family.
See UC IPM's Common Groundsel Pest
Note for more information.
Broadleaf ID illustration.
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