Taraxacum palustre (Lyons) Symons
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Lvs suberect, rather narrow, remotely toothed; outer invol bracts very dark, broad, strongly and permanently appressed; beak twice as long as the body of the achene; otherwise much like no. 3 [Taraxacum officinale F. H. Wigg.]; 2n=24, 32, 40. Seasonally flooded highway-ditches and wet or flooded sites in calcareous gravel or clay over limestone or marble bedrock; native of Europe, rarely intr. in se. Ont. and c. N.Y. Apr.-June. (T. turfosum)