Subgenus Phyllantherum
T. cuneatum, decipiens, decumbens, 'delicatum', discolor, foetidissimum, 'freemanii', gracile, 'lanceolatum', lancifolium, ludovicianum, luteum, maculatum, oostingii, radiatum, recurvatum, reliquum, sessile, stamineum, underwoodii, viride, viridescens & Unidentified Species
Subgenus Trillium
T. catesbaei, cernuum, erectum, flexipes, grandiflorum, nivale, persistens, pusillum, rivale, rugelii, simile, sulcatum & vaseyi