Species:
Camissonia contorta (contorted suncup, plains evening-primrose)
Chamaenerion angustifolium (fireweed)
Circaea alpina ssp. pacifica (enchanter's-nightshade)
Clarkia pulchella (ragged-robin, pink fairies, elkhorn clarkia)
Clarkia rhomboidea (diamond-petal clarkia or farewell-to-spring)
Epilobium brachycarpum (annual willow-herb)
Epilobium campestre (smooth spike-primrose)
Epilobium ciliatum ssp. ciliatum (common or Watson's willow-herb)
Epilobium densiflorum (dense spike-primrose)
Epilobium lactiflorum (white-flowered willowherb, milkflower willowherb)
Epilobium suffruticosum (shrubby willow-herb)
Epilobium torreyi (Torrey's, brook, or stiff spike-primrose)
Eremothera boothii ssp. alyssoides (mooncup, alyssum evening-primrose)
Gayophytum diffusum ssp. diffusum (spreading or large-flowered groundsmoke)
Gayophytum diffusum ssp. parviflorum (smallflower groundsmoke)
Gayophytum humile (dwarf groundsmoke)
Gayophytum racemosum (racemed or Blackfoot groundsmoke)
Gayophytum ramosissimum (hairstem groundsmoke)
Oenothera biennis (common evening-primrose)
Oenothera caespitosa ssp. marginata (tufted or fragrant evening-primrose)
Oenothera curtiflora (velvetweed, small-flowered gaura)
Oenothera elata ssp. hirsutissima (Hooker's evening-primrose)
Oenothera pallida ssp. pallida (pale or white-stemmed evening-primrose)
Oenothera villosa ssp. strigosa (hairy evening-primrose)
Oenothera villosa ssp. villosa (hairy evening-primrose)
Taraxia subacaulis (northern or longleaf suncup, goldeneggs diffuse evening-primrose)
Taraxia tanacetifolia (tansyleaf suncup or goldeneggs)