Description:
Yellow devil hawkweed is a perennial herb with many slender and
leafy stolons (horizontal stems) at the base of the plant, and a
long rhizome (underground stem). This hawkweed has a well developed
cluster of basal leaves at time of flowering in the early summer.
The basal leaves are glaucous (covered with a whitish or bluish
waxy coating), and as large as or larger than any of the upper leaves.
The top of the leaf is smooth whereas the underside of the leaf
has scattered, bristly hairs, particularly along the mid-rib. The
leaves range in size from 11⁄2 - 5 inches long, the leaf shape
is longer than wide, with the widest part being near the tip. The
leaf margins toward the base are also covered with long bristles.
The leaves along the stolon are more hairy than the basal leaves.
The single flowering stem is 8 - 32 inches tall, sparsely scattered
with long bristles that are blackish and tipped with star-like glands.
The complete flowers are yellow composites, with 3-50 flower heads
in a flat-topped cluster. The bracts under the flower heads have
the same stiff hairs (as along the stem) that are blackish and tipped
with star-like glands. (Gleason and Cronquist 1991; Muenscher 1995).
For More Information:
Detailed information about Yellow
Devil Hawkweed is available at the Washington State Noxious
Weed Control Board Web Site. |
