- Boisduvalia densiflora — denseflower spike-primrose
- Boisduvalia glabella — smooth spike-primrose
- Calylophus serrulatus — yellow evening-primrose
- Camissonia andina — Blackfoot River suncup
- Camissonia breviflora — shortflower suncup
- Camissonia contorta — dwarf contorted suncup
- Circaea alpina — small enchanter's-nightshade
- Circaea lutetiana — southern broadleaf enchanter's-nightshade
- Circaea x intermedia — intermediate enchanger's-nightshade
- Clarkia amoena — farewell-to-spring
- Clarkia pulchella — largeflower clarkia
- Clarkia purpurea — winecup clarkia
- Clarkia rhomboidea — tongue clarkia
- Epilobium anagallidifolium — alpine willowherb
- Epilobium angustifolium — fireweed
- Epilobium arcticum — arctic willowherb
- Epilobium brachycarpum — panicled willowherb
- Epilobium ciliatum — hairy willowherb
- Epilobium clavatum — clavate-fruit willowherb
- Epilobium coloratum — purpleleaf willowherb
- Epilobium davuricum — Dahuria willowherb
- Epilobium foliosum — California willowherb
- Epilobium glaberrimum — glaucous willowherb
- Epilobium halleanum — glandular willowherb
- Epilobium hornemannii — Hornemann's willowherb
- Epilobium lactiflorum — whiteflower willowherb
- Epilobium latifolium — river beauty
- Epilobium leptocarpum — slender-fruited willowherb
- Epilobium leptophyllum — linear-leaved willowherb
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- Epilobium luteum — yellow willowherb
- Epilobium minutum — smallflower willowherb
- Epilobium mirabile — Olimple Mountain willowherb
- Epilobium oregonense — Oregon willowherb
- Epilobium palustre — marsh willowherb
- Epilobium saximontanum — Rocky Mountain willowherb
- Epilobium strictum — downy willowherb
- Epilobium x wisconsinense
- Gaura biennis — biennial gaura
- Gaura coccinea — scarlet gaura
- Gayophytum diffusum — diffuse groundsmoke
- Gayophytum humile — low groundsmoke
- Gayophytum racemosum — racemed groundsmoke
- Gayophytum ramosissimum — much-branch groundsmoke
- Ludwigia alternifolia — bushy seedbox
- Ludwigia palustris — marsh seedbox
- Ludwigia polycarpa — many-fruit false-loosestrife
- Oenothera biennis — common evening-primrose
- Oenothera caespitosa — tufted evening-primrose
- Oenothera clelandii — lesser four-point evening-primrose
- Oenothera elata — Hooker's evening-primrose
- Oenothera flava — long-tubed evening-primrose
- Oenothera fruticosa — narrowleaf sundrops
- Oenothera nuttallii — white-stemmed evening-primrose
- Oenothera oakesiana — Oakes' evening-primrose
- Oenothera pallida — pale evening-primrose
- Oenothera parviflora — northern evening-primrose
- Oenothera perennis — small sundrops
- Oenothera pilosella — meadow evening-primrose
- Oenothera villosa — hairy evening-primrose
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