| Little-leaved Buttercup | Ranunculus | abortivus | | 476 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Tall Buttercup | Ranunculus | acris | | 33 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Allegheny Mountain Buttercup | Ranunculus | allegheniensis | | 3 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Water-plaintain Spearwort | Ranunculus | ambigens | | 15 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Bulbous Buttercup | Ranunculus | bulbosus | | 281 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Swamp Buttercup | Ranunculus | caricetorum | | 0 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Early Buttercup | Ranunculus | fascicularis | | 7 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Yellow Water Buttercup | Ranunculus | flabellaris | | 18 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Ivy Buttercup | Ranunculus | hederaceus | | 8 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Hispid Buttercup (nitidus) | Ranunculus | hispidus var. nitidus | | 38 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Bristly Buttercup (hispidus) | Ranunculus | hispidus var. hispidus | | 3 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Bristly Buttercup | Ranunculus | hispidus | | 82 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Mississippi Buttercup | Ranunculus | laxicaulis | | 3 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Rock Buttercup | Ranunculus | micranthus | | 26 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Small-flowered Buttercup | Ranunculus | parviflorus | | 86 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Pennsylvania Buttercup | Ranunculus | pensylvanicus | | 2 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Low Spearwort | Ranunculus | pusillus | | 29 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Hooked Buttercup | Ranunculus | recurvatus | | 232 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Creeping Buttercup | Ranunculus | repens | | 17 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Hairy Buttercup | Ranunculus | sardous | | 5 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |
| Cursed Buttercup | Ranunculus | sceleratus var. sceleratus | | 122 | Buttercup Family | Ranunculaceae | Ranunculales | Magnoliopsida | Plantae |