toadshade n trillium of northeastern United States with sessile leaves and red or purple flowers having a pungent odor Usage(s) toadshade, climbing bittersweet, birdsfoot trefoil, moth mullein, smooth false foxglove, showy rattlebox, prince's plume, agrimony, squawroot, mouse-ear hawkweed,. Synonym(s) red trillium sessile trillium Trillium sessile