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Family: Trilliaceae (Trillium family)
Mid-Atlantic bloom time:
April - May
Mid-Atlantic bloom time:
late July - August
Painted Trillium's Latin species name undulatum means wavy, referring to its petals' wavy margins. Its petals are white, typically with an inverted red "V" near their base (rarely, some specimens may lack the red "V").
Painted Trillium prefers very acidic humus-rich soils.
Recent molecular evidence strongly supports the moving Painted Trillium into the genus Trillidium, joining Trillidium govanianum as the second species in that previously monotropic genus.1
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19 May 2023
Shenandoah Mountain, Augusta County, VA 
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19 May 2023
Shenandoah Mountain, Augusta County, VA 
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19 May 2023
Shenandoah Mountain, Augusta County, VA 
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19 May 2023
Shenandoah Mountain, Augusta County, VA 
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7 May 2025
Shenandoah Mountain, Augusta County, VA (unusual 4-petal flower) 
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7 May 2025
Shenandoah Mountain, Augusta County, VA (unusual 4-petal flower) 
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30 May 2014
Ricketts Glen State Park, Benton, PA (petals fading, fertilized ovary swelling) 
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30 May 2014
Ricketts Glen State Park, Benton, PA (petals fading, fertilized ovary swelling) 
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References
1:
Weakley, Alan S., et al.
"New Combinations, Rank Changes, and Nomenclatural and Taxonomic Comments in the Vascular Flora of the Southeastern United States. IV."
Journal of the Botanical Research Institute of Texas, vol. 12, no. 2, 2018, pp. 461–80.
"Trillidium: Trillium undulatum as the second species of Trillidium", p. 477,
citing
Trillidium undulatum (Willd.) Floden & Schilling, comb. nov. Basionym: Trillium undulatum Willd.
Der Gesellsschaft Naturforschender Freunde zu Berlin, neue Schriften 3:422. 1801.
Type: North America. U.S.A.: Habitat in Pennsylvania ("Wächst in Pensylvanien") (lectotype, designated here: B, B-W 07091-010).
PDF accessed via JSTOR