• Aconitum columbianum Nutt., Columbian monkshood, Native, Common, Photos Phytoimages, USDA_Plants

• Actaea rubra (Aiton) Willd., Red baneberry, Including: Actaea rubra ssp. arguta (Nutt.) Hultén, Native, Common, Photos Phytoimages, USDA_Plants

• Anemone canadensis L., Canadian anemone, Meadow anemone, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Anemone cylindrica A.Gray, Candle anemone, Thimbleflower, Native, Common, Photos Phytoimages, USDA_Plants

• Anemone multifida Poir., Cut-leaved anemone, Globe anemone, Including: Anemone multifida ssp. saxicola B. Boivin, Native, Common, Photos Phytoimages, USDA_Plants

• Anemone narcissiflora L. var. zephyra (A. Nelson) Dutton & Keener, Narcissus anemone, Native, Common, Photos Phytoimages, USDA_Plants

• Anemone parviflora Michx. var. parviflora, Small-flowered anemone, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Anemone patens subsp. multifida (Pritz.) Hultén, Pasque Flower, Synonym: Pulsatilla patens (L.) Mill. ssp. hirsutissima (Pursh) Zamels, Pulsatilla patens var. multifida (Pritz.) S.H.Li & Y.H.Huang, Pulsatilla patens subsp. multifida (Pritz.) Zämelis, Native, Common, Photos Phytoimages, USDA_Plants

• Aquilegia coerulea James var. coerulea, Colorado blue columbine, Synonym: Aquilegia coerulea James var. daileyae Eastw., Native, Common, Photos Phytoimages, USDA_Plants

• Aquilegia coerulea James var. ochroleuca Hook., Colorado blue columbine, Native, Common, Photos Phytoimages, USDA_Plants

• Aquilegia elegantula Greene, Western red columbine, Rocky Mountain red columbine, Native, Common, Photos Phytoimages, USDA_Plants

• Aquilegia saximontana Rydb., Rocky Mountain blue columbine, Dwarf blue columbine, Native, Common, Photos Phytoimages, USDA_Plants

• Caltha leptosepala DC., Marsh marigold, Native, Common, Photos Phytoimages, USDA_Plants

• Clematis columbiana (Nutt.) Torr. & A. Gray var. columbiana, Rock clematis, Synonym: Atragene columbiana Nutt., Clematis pseudoalpina (Kuntze) A. Nelson, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Clematis grosseserrata (Rydb.) Ackerfield, Western blue virgin's bower, Synonyms: Atragene grosseserrata Rydb, C. occidentalis (Horneem.) DC. var.grosseserrata (Rydb.) J. Pringle, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Clematis hirsutissima Pursh, Sugar bowls, Synonym: Coriflora hirsutissima (Pursh) W.A. Weber, Native, Common, Photos Phytoimages, USDA_Plants

• Clematis ligusticifolia Nutt., Western white virgin's bower, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Clematis occidentalis var. occidentalis, Western blue virginsbowe, Native, Common, Photos Phytoimages, USDA_Plants

• Clematis orientalis L., Oriental virgin's bower, Synonym: Viticella orientalis (L.) W.A. Weber, Native, Boulder Co., Photos Phytoimages, USDA_Plants

• Delphinium barbeyi (Huth) Huth, Subalpine larkspur, Native, Common, Photos Phytoimages, USDA_Plants

• Delphinium carolinianum Walter ssp. virescens (Nutt.) R.E. Brooks, Carolina larkspur, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Delphinium geyeri Greene, Geyer's larkspur, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Delphinium nuttallianum Pritz. ex Walp., Nuttall's larkspur, Nelsons Larkspur, Synonym: Delphinium nelsonii Greene, Native, Common, Photos Phytoimages, USDA_Plants

• Delphinium occidentale (S. Watson) S. Watson, Western larkspur, Native, Jackson & Grand Cos., Photos Phytoimages, USDA_Plants

• Delphinium ramosum S.Watson, Mountain larkspur, Native, Common, Photos Phytoimages, USDA_Plants

• Myosurus apetalus C. Gay var. montanus (G.R. Campb.) Whitemore, Bristly mousetail, Native, Jackson & Grand Cos., Photos Phytoimages, USDA_Plants

• Myosurus minimus L., Tiny mousetail, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ranunculus abortivus L., Littleleaf buttercup, Early woodbuttercup, Kidney-leaf buttercup, Smallflower buttercup, Smallflower crowfoot, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Ranunculus acriformis A. Gray, Sharp buttercup, Sharpleaf buttercup, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ranunculus acris L., Tall buttercup, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Ranunculus adoneus A. Gray, Alpine buttercup, Snow buttercup, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus alismifolius Geyer ex Benth. var. montanus S. Watson, Water plantain buttercup, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Ranunculus aquatilis L. var. diffusus With., Water crowfoot, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ranunculus cardiophyllus Hook., Showy buttercup, Heart-leaved buttercup, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus cymbalaria (Pursh) Greene, Marsh buttercup, Shore buttercup, Synonym: Halerpestes cymbalaria (Pursh) Greene, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus eschscholtzii Schltdl., Eschscholtz's buttercup, Subalpine buttercup, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Ranunculus flammula L. var. ovalis (Bigelow) L.D. Benson, Creeping spearwort, Greater creeping spearwort, Synonym: Ranunculus reptans L. var. ovalis (Bigelow) Torr. & A. Gray, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ranunculus gelidus Kar. & Kir., Tundra buttercup, Synonym: Ranunculus karelinii Czern. Not listed in Ackerfield (2015) for Larimer county, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Ranunculus glaberrimus Hook. var. ellipticus (Greene) Greene, Sagebrush buttercup, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus gmelinii DC., Gmelin's buttercup, Yellow water crowfoot, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus hyperboreus Rottb., Floating buttercup, Artic buttercup, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus inamoenus Greene, Graceful buttercup, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus macounii Britton, Macoun Buttercup, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus pedatifidus Sm. var. affinis (R. Br.) L.D. Benson, Northern buttercup, Birdfoot buttercup, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Ranunculus pensylvanicus L. f., Pennsylvania buttercup, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ranunculus pygmaeus Wahlenb., Pygmy buttercup, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Ranunculus ranunculinus (Nutt.) Rydb., Tadpole buttercup, Synonym: Cyrtorhyncha ranunculina (Nutt.) Rydb., Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus repens L., Creeping buttercup, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Ranunculus sceleratus L. var. multifidus Nutt., Blister buttercup, Cursed buttercup, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Ranunculus testiculatus Crantz, Bur buttercup, Synonym: Ceratocephala testiculata (Crantz) Roth, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Ranunculus trichophyllus Chaix ex Vill., Water crowfoot, Native, Common, Photos Phytoimages, USDA_Plants

• Ranunculus uncinatus D. Don, Woodland buttercup, Hooked buttercup, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Thalictrum alpinum L., Alpine Meadowrue, Native, Common, Photos Phytoimages, USDA_Plants

• Thalictrum dasycarpum Fisch. & Avé-Lall., Purple meadow-rue, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Thalictrum fendleri Engelm. ex A. Gray, Fendler Meadowrue, Native, Common, Photos Phytoimages, USDA_Plants

• Thalictrum sparsiflorum Turcz. ex Fisch. & C.A. Mey., Few-flowered meadowrue, fewflower meadow-rue, Including: Thalictrum sparsiflorum var. saximontanum Turcz. ex Fisch. & C.A. Mey., Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Trollius albiflorus (A. Gray) Rydb., White Globeflower, Synonym: Trollius laxus Salisb. ssp. albiflorus (A. Gray) Á. Löve & D. Löve & Kapoor, Native, Common, Photos Phytoimages, USDA_Plants

Resedaceae

• Reseda lutea L., Yellow mignonette, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Reseda luteola L., Weld, Dyer's rocket, Introduced, Boulder & Weld Cos., Photos Phytoimages, USDA_Plants

Rhamnaceae

• Ceanothus fendleri A.Gray, Fendler's buckthorn, Fendler's ceanothus, Buckbrush, Native, Common, Photos Phytoimages, USDA_Plants

• Ceanothus herbaceus Raf., New Jersey tea, Redroot, Synonym: Ceanothus ovatus Desf., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Ceanothus velutinus Douglas ex Hook., Tobacco-brush, Sticky laurel, Mountain balm, Native, Common, Photos Phytoimages, USDA_Plants

• Rhamnus cathartica L., Common buckthorn, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Rhamnus frangula L., Glossy buckthorn, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants