Polygonaceae

• Bistorta bistortoides (Pursh) Small, American bistort, Synonym: Polygonum bistortoides Pursh, Native, Common, Photos Phytoimages, USDA_Plants

• Bistorta vivipara (L.) Gray, Alpine bistort, Serpent-grass, Synonym: Polygonum viviparum (L.) Ronse Decr., Polygonum viviparum L. = Persicaria vivipara (L.) Ronse Decr., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum alatum Torr., Winged buckwheat, Native, Common, Photos Phytoimages, USDA_Plants

• Eriogonum annuum Nutt., Annual buckwheat, Native, Weld & Boulder Cos., Photos Phytoimages, USDA_Plants

• Eriogonum arcuatum Greene var. xanthum (Small) Reveal, Ivy league buckwheat, Synonym: Eriogonum flavum Nutt. var. xanthum (Small) S. Stokes, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum brevicaule Nutt., Shortstem buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum cernuum Nutt., Nodding buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum effusum Nutt., Spreading buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum exilifolium Reveal, Dropleaf buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum flavum Nutt. ex Benth., Golden buckwheat, Alpine golden buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum jamesii Benth. var. jamesii, James' buckwheat, Including: Eriogonum jamesii var. flavescens Greene, Eriogonum jamesii var. xanthum (Small) Reveal, Native, Common, Photos Phytoimages, USDA_Plants

• Eriogonum lonchophyllum Torr. & A. Gray, Spearleaf buckwheat, Native, Grand Co., Photos Phytoimages, USDA_Plants

• Eriogonum ovalifolium Nutt. var. purpureum (Nutt.) Durand, Cushion buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum pauciflorum Pursh, Fewflower buckwheat, Native, Weld Co., Photos Phytoimages, USDA_Plants

• Eriogonum umbellatum Torr. var. umbellatum, Common sulphur flower, Sulphur flower buckwheat, Native, Common, Photos Phytoimages, USDA_Plants

• Eriogonum umbellatum Torr. var. aureum (Gandog.) Reveal, Golden sulphur flower, Sulphur flower buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum umbellatum Torr. var. majus Hook., Sulphur-flower buckwheat, Native, Common, Photos Phytoimages, USDA_Plants

• Eriogonum umbellatum Torr. var. porteri (Small) S. Stokes, Porter's sulphur flower, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum umbellatum Torr. var. ramulosum Reveal, Buffalo Bill's sulphur fower, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Eriogonum umbellatum var. umbellatum Torr., Sulphur-flower buckwheat, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Fagopyrum esculentum Moench, Common buckwheat, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Fallopia baldschuanica (Regel) Holub, Bukhara fleeceflower, Synonyms: Polygonum aubertii Henry, Polygonum baldschuanicum Regel, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Fallopia convolvulus (L.) Á. Löve, Black bindweed, Synonym: Polygonum convolvulus L., Introduced, Common, Photos Phytoimages, USDA_Plants

• Fallopia scandens (L.) Holub, Climbing false buckwheat, Synonym: Polygonum scandens L., Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Koenigia islandica L., Island koeniga, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Oxyria digyna (L.) Hill, Alpine Mountain sorrell, Alpine sorrell, Native, Common, Photos Phytoimages, USDA_Plants

• Persicaria amphibia (L.) Delarbe, Water smartweed, Synonym: Polygonum amphibium var. emersum (L.) Delarbre, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Persicaria bicornis (Raf.) Nieuwl., Pink smartweed, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Persicaria hydropiper (L.) Opiz, Water pepper, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Persicaria lapathifolia (L.) Gray, Pale smartweed, Curlytop knotweed, Synonym: Polygonum lapathifolium (L.) Delarbre, Introduced, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Persicaria maculosa Gray, Lady's thumb, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Persicaria pensylvanica (L.) Small, Pennsylvania smartweed, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Persicaria punctata (Elliott) Small, Dotted smartweed, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Polygonum achoreum S.F. Blake, Blake's knotweed, Leathery knotweed, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Polygonum argyrocoleon Steud. ex Kunze, Silversheath knotweed, Introduced, Boulder Co., Photos Phytoimages, USDA_Plants

• Polygonum aviculare L., Prostrate knotweed, Synonym: Polygonum arenastrum Jord. ex Boreau, P. buxifrme Small, Introduced, Common, Photos Phytoimages, USDA_Plants

• Polygonum douglasii Greene, Douglas' knotweed, Native, Common, Photos Phytoimages, USDA_Plants

• Polygonum engelmannii Greene, Engelmann's knotweed, Synonym: Polygonum douglasii Greene ssp. engelmannii (Greene) Kartesz & Gandhi, Native, Common, Photos Phytoimages, USDA_Plants

• Polygonum kelloggii Greene var. kelloggii, Kellogg's knotweed, Synonym: Polygonum polygaloides Wall. ex Meisn. ssp. kelloggii (Greene) J.C. Hickman, Native, Common, Photos Phytoimages, USDA_Plants

• Polygonum kelloggii Greene var. confertiflorum (Nutt. ex Piper) Dorn, Kellogg's knotweed, Synonym: Polygonum confertiflorum Nutt. ex Piper, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Polygonum minimum S. Watson, Broadleaf knotweed, dwarf knotweed, zigzag knotweed, Native, Uncommon, Photos Phytoimages, USDA_Plants

• Polygonum ramosissimum Michx., Bushy knotweed, Tall knotweed, Yellow knotweed, Yellow-flower knotweed, Native, Abundance - Unknown, Photos Phytoimages, USDA_Plants

• Polygonum sawatchense Small, Sawatch knotweed, Synonym: Polygonum douglasii Greene ssp. johnstonii (Munz) J.C. Hickman, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Rheum rhabarbarum L., Rhubarb, Garden rhubarb, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Rumex acetosella L., Sheep sorrel, Common sheep sorrel, Synonym: Acetosella vulgaris (W. D. J. Koch) Fourr., Introduced, Common, Photos Phytoimages, USDA_Plants

• Rumex altissimus Alph. Wood, Pale dock, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Rumex crispus L., Curly dock, Introduced, Common, Photos Phytoimages, USDA_Plants

• Rumex densiflorus Osterh., Dense-flowered dock, Synonym: Rumex praecox Rydb., Native, Jackson, Grand & Boulder Cos., Photos Phytoimages, USDA_Plants

• Rumex fueginus Phil., Golden dock, Synonym: Rumex maritimus L. ssp. fueginus (Phil.) Hultén, Rumex maritimus L. var. fueginus (Phil.) Dusén, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Rumex obtusifolius L., Bitter dock, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Rumex occidentalis S. Watson, Western dock, Synonym: Rumex aquaticus var. fenestratus S. Watson, Native, Common, Photos Phytoimages, USDA_Plants

• Rumex paucifolius Nutt., Alpine sheep sorrel, Synonym: Acetosella paucifolia (Nutt.) Á. Löve, Native, Jackson & Grand Cos., Photos Phytoimages, USDA_Plants

• Rumex stenophyllus Ledeb., Narrowleaf dock, Introduced, Larimer Co., Photos Phytoimages, USDA_Plants

• Rumex triangulivalvis (Danser) Rech. f., Willow dock, Synonym: Rumex salicifolius Weinm. ssp. triangulivalvis Danser, Native, Common, Photos Phytoimages, USDA_Plants

• Rumex utahensis Rech. f., Utah willow dock, Native, Larimer Co., Photos Phytoimages, USDA_Plants

• Rumex venosus Pursh, Wild begonia, Veiny dock, Native, Larimer Co., Photos Phytoimages, USDA_Plants