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DESCRIPTION:
Horseweed, also called mare's tail, is a summer annual or biennial. If undisturbed,
the plant grows erect, branching only near the top. Mature plants can reach up
to 10 feet (3 m) tall. Shorter, mowed plants may look
similar to hairy fleabane, but horseweed has
dark green leaves while hairy fleabane has gray green leaves. Seed leaves are
oval with fine hairs. Leaves of young
plants grow as a rosette around a crown. Later plants grow erect and leaves
are alternate, dark green and crowded on stems. Small, yellowish flower heads
are borne at the end of branched stems
and are slightly larger than those of horseweed. It competes severely for water
and grows rapidly.
Broadleaf ID illustration.
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