Trillidium undulatum Floden & E.E. Schilling. Phen: Late Apr-May; late Jul-Aug. Hab: Acidic soils of ridges, slopes, and bog margins, mostly at high elevations and often associated with Rhododendron, Tsuga, Pinus, or Picea. Dist: NB, e. QC, s. ON, and MI, south to w. NC, nw. SC, n. GA, e. TN, and ne. OH.
ID notes:The leaves are distinctly petiolate, often ca. 1 cm long, and the leaves have a blue-green cast; populations often have a large number of "monillidiums" – 1-leaved juvenile plants. Petals are white with a red blaze, or rarely more or less lacking the blaze (Patrick 1985). Trillidium undulatum occurs in more acidic sites than any species of Trillium.
Origin/Endemic status: Native
Taxonomy Comments: See Floden & Schilling (2018b) for detailed discussion of the reasons for treating this species in Trillidium.
Synonymy: = K4, Floden & Schilling (2018b) in Weakley et al (2018b); = Trillium undulatum Willd. – C, F, FNA26, G, K1, K3, Mi, NE, NY, Pa, RAB, S, Tn, Va, W, WV, Case & Case (1997), Patrick (1986), Patrick (2007)