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Family	Scientific Name	Common Name	Habitat	Distribution	Image
Ranunculaceae	Ranunculus abortivus	Kidneyleaf Buttercup, Early Wood Buttercup	Bottomland and other moist forests, low fields, disturbed areas, lawns, roadsides.	NL (Labrador) to AK, south to FL, TX, and CO.
Ranunculaceae	Ranunculus acris var. acris	Tall Buttercup, Bitter Buttercup	Pastures, fields, roadsides, lawns, disturbed areas.	Native of Europe.
Ranunculaceae	Ranunculus allegheniensis	Allegheny Buttercup, Mountain Crowfoot	Cove forests, rich forested slopes, sometimes in drier forests on calcareous or mafic substrates.	MA west to OH, south to w. NC and ne. TN, an Appalachian endemic.
Ranunculaceae	Ranunculus ambigens	Water-plantain Crowfoot, Water-plantain Spearwort	Marshes, swampy forests, ditches.	ME west to MN, south to VA, NC, ne. TN, w. TN, and LA.
Ranunculaceae	Ranunculus arvensis	Corn Crowfoot, Hungerweed	Fields, disturbed areas.	Native of Europe.
Ranunculaceae	Ranunculus bulbosus	Bulbous Buttercup, St. Anthony’s Turnip	Fields, roadsides, disturbed areas.	Native of Europe.
Ranunculaceae	Ranunculus caricetorum	Northern Swamp Buttercup, Marsh Buttercup	Swampy forests and marshes.	NB west to s. MB, south to NJ, n. VA, s. OH, and s. MO; reports of this species farther south are probably in error.
Ranunculaceae	Ranunculus fascicularis	Thick-root Buttercup, Early Buttercup	Wet flats with prairie affinities (with Camassia scilloides), rocky barrens and glades over mafic rocks (such as gabbro or diabase), ultramafic outcrop barrens (over olivine), limestone barrens, prairies, oak savannas.	MA and NY west to s. ON, MN, and se. MB, south to c. NC, nc. SC, sw. GA, and e. TX; occurrences which are both south of New England and east of the Appalachians are scattered and disjunct.
Ranunculaceae	Ranunculus flabellaris	Yellow Water Crowfoot	Pools in floodplains of small stream swamps, ponds, borrow pits, other stagnant or slowly moving waters.	ME west to BC, south to ne. NC, KY, IN, IL, LA, OK, UT, and CA.
Ranunculaceae	Ranunculus flammula var. ovalis	Greater Creeping Spearwort	Sandy and muddy shores.	NL west to AK, south to e. PA, WI, MN, ND, NM, AZ, and CA.
Ranunculaceae	Ranunculus flammula var. reptans	Creeping Spearwort	Shallow water.	Circumboreal, south in North America to NJ, WV, MI, MN, and WY.
Ranunculaceae	Ranunculus harveyi var. harveyi	Harvey's Buttercup, Harvey's Crowfoot	Forests, savannas, shaley bluffs, and prairies, mostly on acidic substrates.	IN, IL, MO, and OK south to TN, AL, and LA.
Ranunculaceae	Ranunculus hederaceus	Ivy-leaved Water Crowfoot, Longstalked Crowfoot	Coastal brackish marshes, other circumneutral marshes.	Se. PA south to SC on the Coastal Plain; disjunct in NL (Newfoundland); also in Europe. Perhaps questionable whether native in North America, though considered native by most authors, including Wiegleb, Bobrov, & Zalewska-Gałosz (2017).
Ranunculaceae	Ranunculus hispidus	Hispid Buttercup, Hairy Buttercup	Rich moist forests, creekbanks, mesic to dry woodlands and forests, bottomlands.	MA and VT west to s. ON, n. IL, and se. KS, south to e. and c. NC, s. GA, s. AL, AR, and ne. OK.
Ranunculaceae	Ranunculus laxicaulis	Coastal Plain Spearwort, Mississippi Buttercup	Marshes, swamps, tidal cypress swamps.	DE south to sw. GA, Panhandle FL (L. Anderson, pers.comm., 2021), west to e. TX, inland in the interior to w. TN, s. IN, s. IL, MO, and KS, almost entirely on the southeastern Coastal Plain.
Ranunculaceae	Ranunculus lingua	Greater Spearwort	On ballast in a seaport.	Native of Eurasia.
Ranunculaceae	Ranunculus longirostris	White Water Crowfoot	Submerged in streams and spring ponds.	Sw. QC west to SK, ID, and OR, south to DE, VA, KY, nc. TN, AL, AR, TX, NM, and AZ.
Ranunculaceae	Ranunculus macranthus	Showy Buttercup	Damp ground.	TX south into Mexico.
Ranunculaceae	Ranunculus marginatus var. trachycarpus	St. Martin’s Buttercup	Moist, disturbed areas, roadsides.	Native of w. Asia.
Ranunculaceae	Ranunculus micranthus	Small-flowered Buttercup, Rock Buttercup	Rich bottomland forests, also upslope on mesic to dry forests and rock outcrops over mafic or calcareous substrates.	MA west to SD, south to e. VA, c. NC, sc. TN, WV, OH, and OK.
Ranunculaceae	Ranunculus muricatus	Roughseed Buttercup	Ditches and marshes.	Native of Europe.
Ranunculaceae	Ranunculus parviflorus	Small-flowered Buttercup, Stickseed Crowfoot	Disturbed areas.	Native of Europe.
Ranunculaceae	Ranunculus pensylvanicus	Bristly Buttercup, Bristly Crowfoot	Wet meadows, floodplains.	NL (Newfoundland) west to AK, south to s. PA (Rhoads & Klein 1993; Rhoads & Block 2007), DE, DC, MD (Whittemore in FNA 1997), WV, OH, n. IN, n. IL, MN, and AZ.
Ranunculaceae	Ranunculus platensis		Lawns, ditches.	Native of South America. Reported for Beaufort, Berkeley, Lee, and Orangeburg counties, SC (Bradley et al. [in prep.]).
Ranunculaceae	Ranunculus pusillus	Low Spearwort, Small Spearwort	Marshes, ditches, other wet habitats.	S. NY south to c. peninsular FL, west to c. TX, north in the interior to OH, IN, and MO.
Ranunculaceae	Ranunculus recurvatus var. recurvatus	Hooked Buttercup, Hooked Crowfoot	Bottomland forests, cove forests, swamps, mesic slope forests.	ME and QC west to MN, south to sw. GA, MS, and OK.
Ranunculaceae	Ranunculus repens	Creeping Buttercup, Meg-many-feet	Low meadows, disturbed areas.	Native of Eurasia.
Ranunculaceae	Ranunculus sardous	Sardinian Buttercup, Hairy Buttercup	Low fields, disturbed areas.	Native of Europe.
Ranunculaceae	Ranunculus sceleratus var. sceleratus	Cursed Buttercup, Celery-leaf Crowfoot	Marshes, ditches, and stream margins.	The species is circumboreal, ranging south in North America (partly introduced, at least southward) to n. FL, LA, TX, and CA.
Ranunculaceae	Ranunculus septentrionalis	Carolina Buttercup	Swamp forests, wet woodlands, open marshy wetlands.	NY west to s. ON, WI, and MN, south to n. peninsular FL, LA, and e. TX.
Ranunculaceae	Ranunculus subrigidus	White Water Crowfoot	Lakes, ponds, and streams with calcareous waters.	NL west to AK, south to CT, MI, KS, TX, CA, CHH; also in Asia east to nw. Europe.
Ranunculaceae	Ranunculus trichophyllus	Threadleaf Water-crowfoot, White Water-crowfoot	Pools, slow-moving water.	Circumboreal, south in North America to VA, c. TN, IL, IA, NE, NM, AZ, CA, and Mexico.
Ranunculaceae	Ranunculus trilobus		Fields, roadsides, ditches.	Native of sw. Europe.