HORSEWEED, Conyza canadensis
(L.) Cronq. 1, lower part of leafy stem; 2, upper part of
stem with flowers; 3, mature flower head; 4, seed; 5,
distribution. Annual, reproducing by seed. Stem stout, erect,
unbranched at base, 1 to 6 feet (0.3 to 1.8 m) tall, with bristly hairs.
Leaves numerous, without petioles, linear, dark green, with scattered
coarse white bristles, margins toothed or entire. Flower heads
numerous, small, in axillary panicles, a narrow-pointed bract at the base
of each head. Ray flowers greenish-white, scarcely noticeable, surrounding
yellow disk flowers. Seeds about 1/16 inch (1.5 mm) long with numerous
slender white bristles on one end. Found in pastures, roadsides,
and wasteland. Also known as marestail.
DWARF FLEABANE, Conyza ramosissima
Cronq. 6, plant; 7, distribution. Similar to the above but
smaller and bushy. Stem 6 to 18 inches (15 to 45 cm) tall, much branched.
Leaves narrow. Flower heads few, scattered. Found
in dry fields and old pastures.