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DESCRIPTION:
Tumble mustard, also known as Jim Hill mustard, is a broadleaf annual with a
highly branched top. The seedling has very small cotyledons and no apparent
stem. The first true leaf is dull green, coarsely
toothed, and has a few hairs along the margin and on the upper surface. Leaves
at the base of mature plants or on rosettes of young winter plants are coarse
and deeply lobed. Leaves near the top are
smaller and deeply incised to form thread-like divisions. The pale yellow flowers
have 4 long petals and are held in groups on thick, spreading stalks. The
fruit, produced on a short stalk, is a
one-ribbed pod 2 to 4 inches (5 - 10 cm) long. Mature plants tend to break off
at the base and tumble in the wind, spreading seed. Do not confuse tumble
mustard with
Russian thistle, also sometimes called tumbleweed,
or
tumble pigweed.
Broadleaf ID illustration.
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