Tragopogon porrifolius L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Glabrous biennial 4-10 dm; lvs to 30 cm, and nearly 2 cm wide, tapering rather gradually from the base, not recurved at the tip; peduncles evidently enlarged and fistulous under the heads in fl and fr; invol bracts mostly ca 8, 2.5-4 cm in fl, slightly to strongly surpassing the purple rays, elongating to 4-7 cm in fr; achenes 25-40 mm, the body thicker than in no. 2 [Tragopogon dubius Scop.] and usually only 10-16 mm, abruptly contracted to the long, slender beak; pappus brownish; 2n=12. Roadsides and waste places, mostly in rather moist soil; European cultigen, established as a weed here and there over much of the U.S. Apr.-Aug.