Trillium subg. Trillium
Found in FNA Volume 26. Treatment on page 96. Mentioned on page 91.
Bract blades not mottled (except sometimes in T. ovatum). Flower pedicellate except subsessile or sessile in T. pusillum var. virginianum. Petals wide-spreading, white, reddish purple, or cream, sometimes with patterns of another color.
Species 15 (15 in the flora).