Stems tall and rather stiff, hairy and rough to the touch, 3 to 12 feet high, often purplish, perennial by fleshy roots and creeping rootstocks. Leaves sessile or short petioled, firm, lanceolate, very rough above, margins serrate, long pointed at the apex, narrowed at the base, opposite or alternate, 2 to 6 inches long, one-half to 1 inch wide. Heads of flowers on long peduncles, 11/2 to 21/2 inches broad. Ray flowers ten to twenty in number, surrounding the yellow or yellowish brown disk. Bracts of the involucres lanceolate, ciliate, with slender, spreading tips. Receptacle chaffy, the chaff oblong-linear and pointed.
Memoir 15 N. Y. State Museum
Tall, Giant Or Wild Sunflower - Helianthus giganteus