Onagraceae

• Chamerion angustifolium ssp. circumvagum (Mosquin) Hoch, Fireweed, Synonym: Chamerion danielsii D. Löve, Epilobium angustifolium L., Native, Common, Photos Phytoimages, USDA_Plants

• Chamerion latifolium L., Dwarf fireweed, Alpine fireweed, Synonym: Chamerion subdentatum (Rydb.) Á. Löve & D. Löve, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Circaea alpina L., Small enchanter's nightshade, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Epilobium anagallidifolium Lam., Pimpernel willow-herb, Pimpernel willow-herb, Alpine willow-herb, Alpine willow-weed, Native, Common, Photos Phytoimages, USDA_Plants

• Epilobium brachycarpum C.Presl, Panicled willow-herb, Autumn willow-herb, autumn willow-weed, tall annual willow-herb, Synonym:, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Epilobium ciliatum Raf., American willow-herb, Fringed willow-herb, Hairy willow-herb, Hairy willow-weed, Synonym:, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Epilobium ciliatum Raf. var. glandulosum (Lehm.) Dorn, Fringed willowherb, glandular willowherb, glandular willowweed, Synonyms: Epilobium ciliatum ssp. glandulosum (Lehm.) Hoch & P.H. Raven, Native, Common, Photos Phytoimages, USDA_Plants

• Epilobium clavatum Trel., Talus willow-herb, Clavatefruit willow-weed, Clubfruit willow-herb, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Epilobium halleanum Hausskn., Glandular willowherb, Hall's willowweed, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Epilobium hirsutum L., Hairy willow-herb, Not listed for Colorado in USDA Plants, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Epilobium hornemannii Rchb. var. hornemannii, Hornemann's willow-herb, Hornemann's willow-weed, Native, Common, Photos Phytoimages, USDA_Plants

• Epilobium hornemannii Rchb. var. lactiflorum (Hausskn.) D. Löve, Broadleaf willow-weed, Milkflower willow-herb, White-flower willow-herb, Synonym: Epilobium lactiflorum Hausskn., Native, Common, Photos Phytoimages, USDA_Plants

• Epilobium palustre L. var. palustre, Marsh willow-herb, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Epilobium palustre L. var. gracile (Farw.) Dorn, Marsh willow-herb, Synonym: Epilobium leptophyllum Raf., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Epilobium saximontanum Hausskn., Rocky Mountain willowherb, Rocky Mountain willowweed, Native, Common, Photos Phytoimages, USDA_Plants

• Gayophytum decipiens F.H. Lewis & Szweykowski, deceptive groundsmoke, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Gayophytum diffusum ssp. parviflorum F.H. Lewis & Szweykowski, Diffuse groundsmoke, Spreading groundsmoke, Native, Common, Photos Phytoimages, USDA_Plants

• Gayophytum racemosum Torr. & A. Gray, Kitchenweed, Blackfoot groundsmoke, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Gayophytum ramosissimum Torr. & A.Gray, Branching groundsmoke, Babysbreath, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Oenothera albicaulis Pursh, Whitest evening primrose, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Oenothera caespitosa Nutt. ssp. caespitosa, Tufted evening primrose, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Oenothera caespitosa Nutt. var. macroglottis (Rydb.) Cronquist, Tufted evening primrose, Synonym: Oenothera cespitosa ssp. macroglottis (Rydb.) W.L. Wagner, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Oenothera caespitosa Nutt. var. marginata (Nutt. ex Hook. & Arn.) Munz, Tufted evening primrose, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Oenothera coloradensis (Rydb.) W.L. Wagner & Hoch, Colorado beeblossom, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Oenothera coronopifolia Torr. & A. Gray, Crownleaf evening primrose, Cut-leaf evening-primrose, Native, Common, Photos Phytoimages, USDA_Plants

• Oenothera curtiflora W.L. Wagner & Hoch, Velvetweed, Synonym: Gaura mollis James, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Oenothera elata Kunth ssp. hirsutissima (A. Gray ex S. Watson) W. Dietr., Western evening primrose, Hooker's evening primrose, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Oenothera flava (A. Nelson) Garrett, Yellow evening-primrose, Long-tube evening primrose, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Oenothera glaucifolia W.L. Wagner & Hoch, False Gaura, Synonym: Stenosiphon linifolius (Nutt. ex James) Heynh., Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Oenothera grandis (Britton) Smyth, Showy evening primrose, Native, Weld Co., Photos Phytoimages, USDA_Plants

• Oenothera howardii (A. Nelson) W.L. Wagner, Howard's evening primrose, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Oenothera lavandulifolia Torr. & A. Gray, Lavender-leaf sundrops, Synonym: Calylophus lavandulifolius (Torr. & A. Gray) P.H. Raven, Native, Weld Co., Photos Phytoimages, USDA_Plants

• Oenothera nuttallii Sweet, Nuttall Evening-primrose, Native, Common, Photos Phytoimages, USDA_Plants

• Oenothera pallida Lindl., Pale evening primrose, 4 suspecies occur in Colorado, Native, Weld Co., Photos Phytoimages, USDA_Plants

• Oenothera serrulata Nutt., Yellow sundrops, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Oenothera suffrutescens (Ser.) W.L. Wagner & Hoch, Scarlet beeblossom, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Oenothera villosa Thunb., Hairy evening primrose, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Oenothera villosa ssp. strigosa (Rydb.) W. Dietr. & P.H. Raven, Hairy evening primrose, hairy eveningprimrose, hairy evening-primrose, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Taraxia breviflora (Torr. & A. Gray) Nutt. ex Small, Fewflower taraxia, Native, Jackson Co., Photos Phytoimages, USDA_Plants