Ranunculaceae is the family name most commonly known as the buttercup family. With more than 2,000 species of flower in it, it's a rather large family.
What follows is a list of the most common flowers in this family.
- Aconitum
- columbianum, Columbian monkshood
- delphiniifolium, Larkspur-leaf monkshood, Northern monkshood
- Actaea
- pachypoda, White baneberry
- racemosa var. racemosa, Black Bugbane
- rubra, Red baneberry
- Anemone
- canadensis, Round-leaf thimbleweed, Canada anemone, Windflower
- caroliniana, Carolina thimbleweed, Carolina anemone, Southern thimbleweed
- cylindrica, Long-head thimbleweed, Thimbleweed
- multifida, Red windflower, Early thimbleweed, Cut-leaf anemone, Pacific anemone
- narcissiflora, Narcissus-flower thimbleweed, Narcissis-flowered anemone
- quinquefolia, Nightcaps, Wood anemone
- virginiana, Tall thimbleweed, Thimbleweed, Tall anemone
- Aquilegia
- caerulea, Colorado blue columbine, Rocky Mountain columbine
- canadensis, Red columbine
- chrysantha, Golden columbine
- eximia, Van Houtte's cloumbine, Serpentine columbine
- flavescens, Yellow columbine
- formosa, Crimson columbine, Scarlet columbine
- jonesii, Blue limestone columbine
- Caltha
- leptosepala, White marsh-marigold, Elkslip
- palustris, Yellow marsh-marigold, Cowslip
- palustris var. palustris, Marsh-marigold, Cowslip
- Clematis
- columbiana, Columbian virgin's-bower, Purple virgin's bower
- crispa, Swamp leather-flower
- hirsutissima, Sugarbowls, Clematis, Vase flower, Leather flower, Lion's beard
- lasiantha, Pipestem, Pipestem clematis
- occidentalis var. occidentalis, Purple clematis
- pitcheri, Bluebill, Leather-flower, Purple clematis
- texensis, Scarlet leather-flower, Scarlet clematis
- virginiana, Devil's-darning-needles, Virgin's bower
- Coptis
- Delphinium
- barbeyi, Subalpine larkspur
- bicolor, Flat-head larkspur, Little larkspur
- cardinale, Scarlet larkspur
- carolinianum, Carolina larkspur, Blue larkspur
- carolinianum ssp. Virescens, Prairie larkspur
- glareosum, Olympic larkspur, Delphinium
- glaucum, Tower larkspur
- nudicaule, Christmashorns, Red larkspur
- nuttallianum, Two-lobe larkspur, Delphinium
- parishii, Ocean-blue larkspur, Desert larkspur, Paleface delphinium
- scaposum, Bare-stem larkspur
- tricorne, Dwarf larkspur
- Hepatica
- nobilis var. acuta, Sharp-lobed hepatica
- nobilis var. obtusa, Round-lobed hepatica
- Hydrastis
- Pulsatilla
- occidentalis, Western pasqueflower, Western anemone
- patens ssp. Multifida, Pasqueflower, Wild crocus
- Ranunculus
- abortivus, Kidney-leaf buttercup, Early wood buttercup
- alismifolius, Water-platain buttercup, Meadow buttercup
- cardiophyllus, Heart-leaf buttercup
- fascicularis, Early buttercup, Tufted buttercup
- macranthus, Large buttercup
- occidentalis, Western buttercup
- Thalictrum
- dasycarpum, Purple meadow-rue, Tall meadow-rue
- dioicum, Early meadow-rue
- fendleri var. polycarpum, Meadow-rue
- pubescens, King-of-the-meadow
- thalictroides, Rue-anemone
- Trollius
I've noded globeflower and Narcissus-flower and I plan on adding more to this list after the holidays.