Slender, branching, usually several-stemmed annual 5-45 cm; lvs basal and cauline, linear-oblong to oblanceolate or a little broader, entire to pinnatifid, 1.5-15 cm נ2-20 mm; some of the upper internodes commonly shortened so that the lvs appear opposite, with several long, sometimes similarly branched and bracteate peduncles in their common axil; heads 8-15 mm wide in fl, yellow with a golden center; invol 3-5 mm high, its bracts 6-10, lanceolate or broader, persistently erect, becoming keeled in fr; pappus wanting, or a mere scaly vestige; 2n=8. Generally in moist, low places; s. Va. to Fla., w. to s. Ill., se. Neb., Kans. and Tex. Apr.-July. (Serinia o.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.