Yellow pincushion is a slender, 1-few branched,
thinly floccose to glabrous annual growing to about 24" tall. Its
leaves are alternate, 1-2 pinnately cleft into narrow linear lobes to
1/4" long, the upper ones linear and entire, and with a basal rosette
generally withering. There are 1-several floral heads per stem,
discoid, the corollas of the outer flowers larger than those of the
more central ones, and bright yellow.