Fagaceae

• Quercus gambelii Nutt., Gambel oak, Synonyms: Quercus eastwoodiae Rydb., Quercus leptophylla Rydb., Native, Boulder Co., Photos Phytoimages, USDA_Plants

Gentianaceae

• Centaurium pulchellum (Sw.) Druce, Branched centaury, Introduced, Weld Co., Photos Phytoimages, USDA_Plants

• Eustoma grandiflorum (Raf.) Shinners, Showy prairie gentian, Synonym: Eustoma exaltatum (L.) Salisb. ex G. Don ssp. russellianum (Hook.) Kartesz, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Frasera speciosa Douglas ex Hook., Elkweed, Monument plant, Native, Common, Photos Phytoimages, USDA_Plants

• Gentiana affinis Griseb., Rocky Mountain gentian, Pleated gentian, Synonym: Pneumonanthe affinis (Griseb.) W.A. Weber, Native, Common, Photos Phytoimages, USDA_Plants

• Gentiana algida Pall., Arctic gentian, Synonym: Gentianodes algida (Pall.) Á. Löve & D. Löve, Native, Common, Photos Phytoimages, USDA_Plants

• Gentiana bigelovii A. Gray, Bigelow's gentian, Synonym: Pneumonanthe bigelovii (A. Gray) Greene, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Gentiana fremontii Torr., Bog Moss gentian, Synonym: Chondrophylla fremontii (Torr.) A. Nelson, Native, Common, Photos Phytoimages, USDA_Plants

• Gentiana parryi Engelm., Parry's gentian, Synonym: Pneumonanthe parryi (Engelm.) Greene, Native, Common, Photos Phytoimages, USDA_Plants

• Gentiana prostrata Haenke, Pygmy gentian, Synonym: Gentiana nutans (Bunge) Halda, Chondrophylla prostrata (Haenke) J.P. Anderson, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Gentianella acuta (Michx.) Hiitonen, Autumn dwarf gentian, Rose gentian, Synonym: Gentianella amarella ssp. acuta (Michx.) J.M. Gillett, Gentiana plebeia Cham. ex Bunge, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Gentianella heterosepala (Engelm.) Holub, Autumn dwarf gentian, Synonym: Gentianella amarella (L.) Börner ssp. heterosepala (Engelm.) J.M. Gillett, Native, Common, Photos Phytoimages, USDA_Plants

• Gentianella tenella ssp. tenella (Rottb.) Börner, Lapland gentian, Dane's dwarf gentian, Synonym: Comastoma tenellum (Rottb.) Toyokuni, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Gentianopsis barbellata (Engelm.) H.H.Iltis, Perennial fringed gentian, Synonym: Gentiana barbellata Engelm., Native, Uncommon, Photos Phytoimages, USDA_Plants

• Gentianopsis detonsa (Rottb.) Ma var. elegans (A. Nelson) N.H. Holmgren, Rocky Mountain fringed gentian, Synonym: Gentiana thermalis Kuntze, Native, Common, Photos Phytoimages, USDA_Plants

• Lomatogonium rotatum (L.) Fr. ex Fernald, Marsh felwort, Synonym: Pleurogyne rotata (L.) Griseb., Native, Common, Photos Phytoimages, USDA_Plants

• Swertia perennis L., Felwort, Star gentian, Native, Common, Photos Phytoimages, USDA_Plants

Geraniaceae

• Erodium cicutarium (L.) L'Her. ex Ait., Filaria, Filaree, Introduced, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Geranium bicknellii Britton, Bicknell's cranesbill, Introduced?, Larimer Co., Photos Phytoimages, USDA_Plants

• Geranium caespitosum E.James, Rocky Mountain geranium, Wild geranium, Synonyms: Geranium atropurpureum A. Heller, Geranium fremontii Torr. ex A. Gray, Geranium parryi (Engelm.) A. Heller, Native, Common, Photos Phytoimages, USDA_Plants

• Geranium pusillum L., Small geranium, Introduced, Boulder & Weld Cos., Photos Phytoimages, USDA_Plants

• Geranium richardsonii Fisch. & Trautv., Richardson's geranium, White geranium, Native, Common, Photos Phytoimages, USDA_Plants

• Geranium viscosissimum Fisch. & C.A. Mey. ex C.A. Mey. var. incisum (Torr. & A. Gray) N.H. Holmgren, Sticky purple geranium, Native, Larimer Co., Photos Phytoimages, USDA_Plants

Grossulariaceae

• Ribes americanum Mill., American black currant, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ribes aureum Pursh var. aureum, golden currant, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ribes aureum Pursh var. villosum DC., golden currant, Synonym: Ribes odoratum H. Wendl., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ribes cereum Douglas, Wax currant, Squaw currant, Native, Common, Photos Phytoimages, USDA_Plants

• Ribes coloradense Coville, Colorado currant, Synonym: Ribes laxiflorum Pursh, Native, Common, Photos Phytoimages, USDA_Plants

• Ribes inerme Rydb., Whitestem gooseberry, Mountain gooseberry, Native, Common, Photos Phytoimages, USDA_Plants

• Ribes lacustre (Pers.) Poir., Prickly currant, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Ribes leptanthum A. Gray, Trumpet gooseberry, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ribes montigenum McClatchie, Alpine prickly currant, gooseberry currant, mountain gooseberry, Native, Common, Photos Phytoimages, USDA_Plants

• Ribes viscosissimum Pursh, Sticky currant, Native, Grand Co., Photos Phytoimages, USDA_Plants

Haloragaceae

• Myriophyllum sibiricum Kom., Shortspike watermilfoil, American watermilfoil, Siberian water-milfoil, Native, Common, Photos Phytoimages, USDA_Plants

• Myriophyllum verticillatum L., Whorled water milfoil, whorl-leaf water milfoil, Native, Boulder & Jackson Cos., Photos Phytoimages, USDA_Plants

Hydrangeaceae

• Jamesia americana Torr. & A. Gray, Waxflower, Fivepetal cliffbush, Native, Common, Photos Phytoimages, USDA_Plants

Hydrocharitaceae

• Elodea bifoliata H. St.John, Twoleaf waterweed, Waterweed, Synonym: Elodea longivaginata H. St. John, Native, Common, Photos Phytoimages, USDA_Plants

• Elodea canadensis Michx., Canadian waterweed, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Najas guadalupensis (Spreng.) Magnus ssp. guadalupensis, Southern waternymph, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

Hydrophyllaceae

• Ellisia nyctelea (L.) L., Aunt Lucy, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Hydrophyllum capitatum Douglas ex Benth. var. capitatum, Woollen-breechs, Ballhead waterleaf, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Hydrophyllum fendleri (A. Gray) A. Heller, Fendler's Waterleaf, Native, Common, Photos Phytoimages, USDA_Plants

• Nemophila breviflora A. Gray, Basin nemophila, Woodlove, Native, Jackson & Grand Cos., Photos Phytoimages, USDA_Plants

• Phacelia alba Rydb., White phacelia, White scorpionweed, White scorpion-weed, Synonym:, Native, Common, Photos Phytoimages, USDA_Plants

• Phacelia denticulata Osterh., Rocky Mountain phacelia, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Phacelia formosula Osterh., Northpark phacelia, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Phacelia gina-glenneae N.D. Atwood & S.L. Welsh, Gina's phacelia, Native, Grand Co., Photos Phytoimages, USDA_Plants

• Phacelia hastata Douglas ex Lehm., Silverleaf phacelia, Scorpion Weed, Native, Common, Photos Phytoimages, USDA_Plants

• Phacelia heterophylla Pursh, Wand phacelia, Variable-leaf scorpion-weed, Varileaf phacelia, Virgate phacelia, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Phacelia sericea (Graham) A. Gray, Silky phacelia, Purple fringe, Native, Common, Photos Phytoimages, USDA_Plants

Hypericaceae

• Hypericum majus (A. Gray) Britton, Greater St. John's-wort, Large St. John's-wort, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Hypericum perforatum L., Common St. John's-wort, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Hypericum scouleri Hook. ssp. nortoniae (M.E. Jones) J.M. Gillett, Norton's St. John's-wort, Southwestern St. John's-wort, Native, Photos Phytoimages, USDA_Plants

Iridaceae

• Iris missouriensis Nutt., Rocky Mountain Iris, Blue Flag, Native, Common, Photos Phytoimages, USDA_Plants

• Sisyrinchium angustifolium Mill, Narrowleaf blue-eyed grass, Not listed for Colorado in USDA Plants, Native, Boulder & Weld Cos., Photos Phytoimages, USDA_Plants

• Sisyrinchium idahoense E.P. Bicknell var. occidentale (E.P. Bicknell) Douglass M. Hend., Idaho blue-eyed grass, Native, Jackson, Grand, Boulder, & Weld Cos., Photos Phytoimages, USDA_Plants

• Sisyrinchium montanum Greene, Rocky Mountain blue-eyed grass, Blue-eyed grass, Native, Common, Photos Phytoimages, USDA_Plants

• Sisyrinchium pallidum Cholewa & Douglass M.Hend., Pale blue-eyed grass, Native, Rare, Photos Phytoimages, USDA_Plants