Rubiaceae

• Galium aparine L., Stickywilly, Cleavers, Synonym: Galium spurium L., Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Galium bifolium S.Watson, Twinleaf bedstraw, twin-leaf bedstraw, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Galium boreale L., Northern Bedstraw, Synonym: Galium septentrionale Roem. & Schult., Native, Common, Photos Phytoimages, USDA_Plants

• Galium trifidum L., Threepetal bedstraw, three-petal bedstraw, Small bedstraw, Synonym: Galium brandegeei A. Gray, Galium trifidum ssp. subbiflorum (Wiegand) Piper, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Galium triflorum Michx., Fragrant bedstraw, Native, Common, Photos Phytoimages, USDA_Plants

• Galium verum L., Yellow spring bedstraw, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

Ruppiaceae

• Ruppia cirrhosa (Petagna) Grande, Spiral ditchgrass, Synonym: Ruppia maritima L. var. occidentalis (S. Watson) Graebn., Native, Larimer Co., Photos Phytoimages, USDA_Plants

Ruscaceae

• Maianthemum racemosum ssp. amplexicaule (Nutt.) LaFrankie, Large false Solomon's seal, Synonym: Smilacina amplexicaulis Nutt., Native, Common, Photos Phytoimages, USDA_Plants

• Maianthemum stellatum (L.) Link, False Solomon's seal, Few-flowered Solomon's seal, Synonym: Smilacina stellata (L.) Desf., Native, Common, Photos Phytoimages, USDA_Plants

Salicaceae

• Populus alba L., White poplar, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Populus angustifolia E.James, Narrow-leaved Cottonwood, Native, Common, Photos Phytoimages, USDA_Plants

• Populus balsamifera L., Balsam poplar, Native, Common, Photos Phytoimages, USDA_Plants

• Populus deltoides W. Bartram ex Marshall, Cottonwood, Including Populus deltoides W. Bartram ex Marshall ssp. monilifera (Aiton) Eckenwalder, Populus deltoides W. Bartram ex Marshall var. wislizeni (S. Watson) Dorn, Native, Common, Photos Phytoimages, USDA_Plants

• Populus tremuloides Michx., Quaking aspen, Native, Common, Photos Phytoimages, USDA_Plants

• Populus X acuminata Rydb., Lanceleaf cottonwood, Populus angustifolia X P. deltoides, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix alba L., White willow, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix amygdaloides Andersson, Peachleaf willow, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix babylonica L., Weeping willow, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix bebbiana Sarg., Bebb Willow, Native, Common, Photos Phytoimages, USDA_Plants

• Salix boothii Dorn, Booth's willow, Blueberry willow, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Salix brachycarpa Nutt., Shortfruit willow, Barrenground willow, Native, Common, Photos Phytoimages, USDA_Plants

• Salix candida Flueggé ex Willd., Silver willow, Sageleaf willow, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix discolor Muhl., Pussy willow, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix drummondiana Barratt ex Hook., Drummond's willow, Native, Common, Photos Phytoimages, USDA_Plants

• Salix eriocephala Michx. var. ligulifolia (C.R. Ball) Dorn, Strapleaf willow, Synonym: Salix ligulifolia (C.R. Ball) C.R. Ball ex C.K. Schneid., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix eriocephala Michx. var. watsonii (Bebb) Dorn, Strapleaf willow, Synonym: Salix lutea Nutt., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix exigua Nutt., Coyote willow, Narrowleaf willow, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix exigua Nutt. ssp. interior (Rowlee) Cronquist, Coyote willow, Narrowleaf willow, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix geyeriana Andersson, Geyer's willow, Native, Common, Photos Phytoimages, USDA_Plants

• Salix glauca L., Grayleaf willow, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix irrorata Andersson, Bluestem willow, Dewystem willow, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix lasiandra Benth. var. lasiandra, Pacific willow, Synonym: Salix lucida Muhl. ssp. lasiandra (Benth.) A.E. Murray, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix lasiandra Benth. var. caudata (Nutt.) Sudw., Pacific willow, Synonym: Salix lucida Muhl. ssp. caudata (Nutt.) A.E. Murray, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix melanopsis Nutt., Dusky willow, Native, Jackson & Grand Cos., Photos Phytoimages, USDA_Plants

• Salix monticola Bebb, Mountain willow, Native, Common, Photos Phytoimages, USDA_Plants

• Salix petiolaris Sm., Meadow willow, slender willow, Synonym: Salix gracilis Andersson, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Salix petrophila Rydb., Alpine willow, Synonym: Salix arctica Pall. var. petrophila (Rydb.) L. Kelso, Native, Common, Photos Phytoimages, USDA_Plants

• Salix planifolia Pursh, Planeleaf willow, Native, Common, Photos Phytoimages, USDA_Plants

• Salix purpurea L., Basket willow, Purple-osier willow, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Salix reticulata L. var. nana (Hook.) Andersson, Snow willow, Synonym: Salix nivalis Hook., Native, Common, Photos Phytoimages, USDA_Plants

• Salix scouleriana Barratt ex Hook., Scouler's willow, Native, Common, Photos Phytoimages, USDA_Plants

• Salix serissima (Bailey ex Arthur) Fernald, Autumn willow, Native, Rare, Photos Phytoimages, USDA_Plants

• Salix wolfii Bebb, Wolf's willow, Native, Common, Photos Phytoimages, USDA_Plants

Sapindaceae

• Acer glabrum Torr., Mountain maple, Rocky Mt. maple, Synonym: Acer glabrum Torr. var. neomexicanum (Greene) Kearney & Peebles, Native, Common, Photos Phytoimages, USDA_Plants

• Acer negundo L., Boxelder, Synonym: Negundo aceroides (L.) Moench, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

Saururaceae

• Anemopsis californica (Nutt.) Hook. & Arn., Yerba mansa, Native, Larimer Co., Photos Phytoimages, USDA_Plants

Saxifragaceae

• Chrysosplenium tetrandrum (Lund ex Malmgr.) Th. Fr., Northern golden saxifrage, Native, Common, Photos Phytoimages, USDA_Plants

• Conimitella williamsii (D.C. Eaton) Rydb., Williams' miterwort, Native, Grand Co., Photos Phytoimages, USDA_Plants

• Heuchera bracteata (Torr.) Ser., Rocky Mountain alumroot, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Heuchera parvifolia Nutt. ex Torr. & A. Gray, Common alumroot, Littleleaf alumroot, Native, Common, Photos Phytoimages, USDA_Plants

• Lithophragma glabrum Nutt., Bulbous woodland star, Smooth woodland star, Synonym: Lithophragma bulbiferum Rydb., Native, Uncommon, Photos Phytoimages, USDA_Plants

• Lithophragma parviflorum (Hook.) Nutt., Smallflower woodland star, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Lithophragma tenellum Nutt., Slender woodland star, Native, Jackson & Grand Cos., Photos Phytoimages, USDA_Plants

• Micranthes odontoloma (Piper) W.A. Weber, Brook saxifrage, streambank saxifrage, Synonym: Saxifraga odontoloma Piper, Native, Common, Photos Phytoimages, USDA_Plants

• Micranthes oregana (Howell) Small, Oregon saxifrage, Synonym: Saxifraga oregana Howell, Native, Grand & Boulder Cos., Photos Phytoimages, USDA_Plants

• Micranthes rhomboidea (Greene) Small, Diamond leaf saxifrage, Synonym: Saxifraga rhomboidea Greene, Native, Common, Photos Phytoimages, USDA_Plants

• Mitella pentandra Hook., Five-star mitrewort, Common mitreroot, Native, Common, Photos Phytoimages, USDA_Plants

• Mitella stauropetala Piper var. stenopetala (Piper) Rosend., Side-flowered mitrewort, Drywoods miterwort, Native, Common, Photos Phytoimages, USDA_Plants

• Saxifraga adscendens L., Wedgeleaf saxifrage, Synonym: Muscaria adscendens (L.) Small p.p., Native, Grand Co., Photos Phytoimages, USDA_Plants

• Saxifraga bronchialis L. var. austromontana (Wiegand) Piper ex G.N. Jones, Spotted saxifrage, Matted saxifrage, Synonym: Ciliaria austromontana (Wiegand) W.A. Weber, Native, Common, Photos Phytoimages, USDA_Plants

• Saxifraga cernua L., Nodding saxifrage, Native, Common, Photos Phytoimages, USDA_Plants

• Saxifraga cespitosa L., Tufted alpine saxifrage, Synonym: Saxifraga cespitosa L. ssp. delicatula (Small) A.E. Porsild, Muscaria delicatula Small, Native, Common, Photos Phytoimages, USDA_Plants

• Saxifraga chrysantha A. Gray, Golden saxifrage, Goldbloom saxifrage, Synonym: Hirculus serpyllifolius (Pursh) W.A. Weber ssp. chrysanthus (A. Gray) W.A. Weber, Native, Common, Photos Phytoimages, USDA_Plants

• Saxifraga flagellaris Willd. ex Sternb. ssp. crandallii (Gandog.) Hultén, Stoloniferous saxifrage, Crandall's saxifrage, Synonym: Hirculus platysepalus (Trautv.) W.A. Weber ssp. crandallii (Gandog.) W.A. Weber, Native, Common, Photos Phytoimages, USDA_Plants

• Saxifraga hirculus L., Yellow marsh saxifrage, Synonym: Hirculus prorepens (Fisher ex Sterb.) Á. Löve & D. Löve, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Saxifraga rivularis L., Weak saxifrage, Alpine brook saxifrage, Pygmy saxifrage, Synonym: Saxifraga debilis Engelm. ex A. Gray, Saxifraga hyperborea R. Br., Native, Common, Photos Phytoimages, USDA_Plants

• Telesonix jamesii (Torr.) Raf., Alumroot brookfoam, James Saxifrage, Synonym: Boykinia jamesii (Torr.) Engl., Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

Scrophulariaceae

• Limosella aquatica L., Water mudwort, Native, Common, Photos Phytoimages, USDA_Plants

• Scrophularia lanceolata Pursh, Lanceleaf figwort, Native, Common, Photos Phytoimages, USDA_Plants

• Verbascum blattaria L., Moth mullein, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Verbascum lychnitis L., White mullein, Not reported for Colorado in USDA Plants, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Verbascum phlomoides L., Orange mullein, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Verbascum thapsus L., Woolly mullein, Introduced, Common, Photos Phytoimages, USDA_Plants

Simaroubaceae

• Ailanthus altissima (Mill.) Swingle, Tree of heaven, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

Smilacaceae

• Smilax lasioneura Hook., Blue ridge carrionflower, Synonym: Smilax herbacea L. var. lasioneura (Hook.) A. DC., Smilax herbacea L. ssp. lasioneura (Small) Rydb., Native, Larimer Co., Photos Phytoimages, USDA_Plants

Solanaceae

• Datura stramonium L., Jimsonweed, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Datura wrightii Regel, Indian apple, Sacred thorn apple, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Hyoscyamus niger L., Fetid nightshade, Black henbane, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Lycium barbarum L., Matrimony vine, Synonym: Lycium halimifolium Mill., Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Nicotiana attenuata Torr. ex S. Watson, coyote tobacco, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Physalis hederifolia A. Gray, Ivy-leaf ground cherry, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Physalis heterophylla Nees, Clammy ground cherry, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Physalis hispida (Waterf.) Cronquist, Prairie ground cherry, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Physalis longifolia Nutt., Longleaf ground cherry, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Physalis virginiana Mill., Virginia ground cherry, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Quincula lobata (Torr.) Raf., Purple ground cherry, Chinese lantern, Synonym: Physalis lobata Torr., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Solanum carolinense L., Carolina horse-nettle, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Solanum dulcamara L., Climbing nightshade, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Solanum elaeagnifolium Cav., Silverleaf nightshade, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Solanum heterodoxum Dunal, Melonleaf nightshade, Introduced, Weld Co., Photos Phytoimages, USDA_Plants

• Solanum jamesii Torr., Wild potato, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Solanum nigrum L, Black nightshade, Synonym: Solanum nigrum L. var. americanum (Mill.) O.E. Schulz, Solanum americanum Mill., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Solanum physalifolium Rusby, Hairy nightshade, Ground cherry nightshade, Synonym: Solanum sarachoides auct. non Sendtn., Introduced, Rare, Photos Phytoimages, USDA_Plants

• Solanum rostratum Dunal, Buffalo bur, Buffalo bur nightshade, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Solanum triflorum Nutt., Cutleaf nightshade, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants