The lily family has been recently split into many families. I've kept the family intact on this page for simplicity's sake, although they are split out into their new families below.
Liliaceae:
Alp Lily, Common Alplily: Lloydia serotina var. serotina (Synonym: Lloydia serotina ssp. serotina)
Little False Solomon's-seal, Starflower Solomon's-seal, Star-flowered False Solomon Plume, Star-flowered False Solomon Seal, Starry False Lily of the Valley: Maianthemum stellatum (Synonyms: Convallaria stellata, Smilacina liliacea, Smilacina stellata, Unifolium liliaceum, Unifolium sessilifolilum, Unifolium stellatum, Vagnera liliacea, Vagnera sessilifolia, Vagnera stellata)
Claspleaf Twistedstalk, Clasp-leaf Twisted-stalk,Clasping-leaf Twisted-stalk, Clasping Twisted-stalk, Twisted Stalk: Streptopus amplexifolius (Synonyms: Streptopus amplexifolius ssp. americanus, Streptopus amplexifolius var. americanus, Streptopus amplexifolius var. chalazatus, Streptopus amplexifolius var. denticulatus, Streptopus amplexifolus var. grandiflorus, Streptopus fassettii, Tortipes amplexifolius, Uvularia amplexifolia)
Melanthiaceae:
Glaucous Death Camas, Glaucous Zigaenus, Mountain Deathcamas: Anticlea elegans (Synonyms: Anticlea coloradensis, Zigadenus alpinus, Zigadenus elegans, Zigadenus elegans ssp. elegans)
Tofieldiaceae:
Northern False Asphodel, Northern Asphodel: Tofieldia coccinea
Scotch False Asphodel, Scotch Asphodel: Tofieldia pusilla (Synonym: Narthecium pusillum)