Flixweed, a winter or early
spring annual sometimes called
tansy mustard, occurs in waste
areas, fields, roadsides, and
ditchbanks in central and
eastern California. Seedlings
have long and narrow leaves on
fine haired stalks. A stub
remains when cotyledons are
shed. The first pair of true
leaves appear to be opposite.
Somewhat thick, the leaves are
alternate and covered with
white downy, star-shaped hairs.
Mature plants, up to 2 feet (60
cm) tall, have yellow flowers
and finely dissected leaves.
Erect branches have long,
flowering stems with seed pods
about one inch (25 mm) long.