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16b. Trillium subg. Phyllantherum Rafinesque, J. Phys. Chim. Hist. Nat. Arts. 91: 72. 1820.
Bract blades green, variously mottled in darker green or bronze, except not mottled in T. petiolatum. Flower sessile. Petals ± erect, except spreading in T. stamineum, mostly dark purple, maroon, yellow, green, or white, sometimes bicolored (dark basally).
Species 23 (23 in the flora): nw, e United States.
SELECTED REFERENCE Freeman, J. D. 1975. Revision of Trillium subgenus Phyllantherum (Liliaceae). Brittonia 27: 1–62.
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