Common Buttercup, Giant Buttercup, Meadow Buttercup, Showy Buttercup, Tall Buttercup: Ranunculus acris (Synonyms: Ranunculus acris var. latisectus) -
Dwarf Plantainleaved Buttercup, Water-plantain Buttercup: Ranunculus alismifolius var. alismellus (Synonym: Ranunculus alismaefolius var. alismellus ) -
Plaintain-leaf Buttercup, Plantain-leaved Buttercup: Ranunculus alismifolius var. alismifolius (Synonym: Ranunuculus alismaefolius var. alismaefolius) -
Hartweg's Buttercup: Ranunculus alismifolius var. hartwegii (Synonyms: Ranunculus alismaefolius var. hartwegii, Ranunculus hartwegii) -
Leafy Water Buttercup, White Water Buttercup: Ranunculus aquatilis var. aquatilis (Synonyms: Ranunculus aquatilis var. hispidulus, Ranunculus trichophyllus, Ranunculus trichophyllus var. hispidulus) -
Threadleaf Crowfoot, Water Buttercup, White Water Buttercup: Ranunculus aquatilis var. diffusus (Synonyms: Ranunculus aquatilis var. capillaceus, Ranunculus aquatilis var. porteri, Ranunculus longirostris, Ranunculus subrigidus, Ranunclus trichophyllus) -
Eschscholtz Buttercup, Eschscholtz's Buttercup, Snow Buttercup, Subalpine Buttercup: Ranunculus eschscholtzii var. eschscholtzii (Synonyms: Ranunculus eschscholtzii var. typicus, Ranunculus nivalis var. eschscholtzii) -
Subalpine Buttercup, Spruce Buttercup, Suksdorf Buttercup, Suksdorf's Buttercup: Ranunculus eschscholtzii var. suksdorfii (Synonym: Ranunculus suksdorfii) -
Creeping Buttercup, Creeping Spearwort, Greater Creeping Spearwort, Lesser Spearwort, Spearwort: Ranunculus flammula var. flammula (Synonyms: Ranunculus flammula var. angustifolius) -
Creeping Buttercup, Creeping Spearwort, Lesser Spearwort: Ranunculus flammula var. ovalis (Synonyms: Ranunculus filiformis var. ovalis , Ranunculus flammula var. samolifolius, Ranunculus reptans var. ovalis) -
Creeping Buttercup, Creeping Spearwort, Lesser Spearwort: Ranunculus flammula var. reptans (Synonyms: anunculus reptans, Ranunculus reptans var. filiformis) -
Arctic Buttercup, Ice Cold Buttercup, Modest Buttercup, Timberline Buttercup, Tundra Buttercup: Ranunculus grayi (Synonyms: Ranunculus gelidus var. grayi, Ranunculus verecundus) -
Sagebrush Buttercup: Ranunculus glaberrimus var. glaberrimus (Synonym: Ranunculus glaberrimus var. typicus) - Klickitat River canyon near the Mineral Springs.
Macoun's Buttercup: Ranunculus macounii (Synonym: Ranunculus macounii var. macounii,
Ranunculus macounii var. oreganus) -
Western Buttercup: Ranunculus occidentalis var. occidentalis (Synonym: Ranunculus occidentalis var. eisenii, Ranunculus occidentalis var. rattanii) -
Straightbeak Buttercup, Straight-beak Buttercup: Ranunculus orthorhynchus var. orthorhynchus (Synonyms: Ranunculus orthorhynchus ssp. alaschensis, Ranunculus orthorhynchus var. alaschensis, Ranunculus orthorhynchus var. hallii) -
Straightbeack Buttercup, Straight-beak Buttercup: Ranunculus orthorhynchus var. platyphyllus (Synonym: Ranunculus orthorhynchus ssp. platyphyllus) -
Creeping Buttercup: Ranunculus repens (Synonyms: Ranunculus repens var. glabratus, Ranunculus repens var. pleniflorus, Ranunculus repens var. repens) -
Little Buttercup, Woodland Buttercup: Ranunculus uncinatus (Synonyms: Ranunculus bongardii, Ranunculus occidentalis var. parviflorus, Ranunculus uncinatus var. parviflorus, Ranunculus uncinatus var. uncinatus) -