This section is from the book "A Manual Of Weeds", by Ada E. Georgia. Also available from Amazon: A Manual Of Weeds.
Native. Perennial. Propagates by seeds. Time of bloom: May to August.
Seeed-time: June to September.
Habitat: Meadows, roadsides, and waste land.
Like its relatives, the Black-eyed Susan and Purple Cone-flower, this plant has been introduced in a number of widely separated localities by the agency of western baled hay and grass seeds. Stem one to nearly three feet tall, branching from the base, slender and beset with stiff, bristly hairs. Leaves alternate, dark green, thick, rough-hairy, strongly ribbed, pinnately divided into narrow, long-pointed segments; those on the stem are sessile or have very short petioles; those at the base have long, slender petioles and fewer segments; occasionally some are undivided and oblong. The heads have an elongated, cone-shaped, or nearly cylindrical disk, often more than an inch in length, set with grayish brown florets, perfect and fertile, the corollas five-lobed but with very short tubes; rays neutral, four to ten in number, large and drooping, yellow with a brownish purple base or wholly of the darker color. Achenes short and flattened, with winged margins, and a pappus of one or two awl-like teeth. (Fig. 325.)
Means of control should be the same as for the Purple Cone-flower.