| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| RAMA4 | Ranunculus marginatus d'Urv. | margined buttercup | Ranunculaceae
|
| RAMAL | Ranunculus mauiensis Gray var. longistylus Skottsberg | Ranunculus mauiensis | Ranunculaceae
|
| RAMA5 | Ranunculus mauiensis Gray | Maui buttercup | Ranunculaceae
|
| RAMIC | Ranunculus micranthus Nutt. var. cymbalistes (Greene) Fern. | Ranunculus micranthus | Ranunculaceae
|
| RAMID | Ranunculus micranthus Nutt. var. delitescens (Greene) Fern. | Ranunculus micranthus | Ranunculaceae
|
| RAMI2 | Ranunculus micranthus Nutt. | rock buttercup | Ranunculaceae
|
| RAMI3 | Ranunculus mississippiensis Small | Ranunculus laxicaulis | Ranunculaceae
|
| RAMU2 | Ranunculus muricatus L. | spinyfruit buttercup | Ranunculaceae
|
| RANAI | Ranunculus natans C.A. Mey. var. intertextus (Greene) L. Benson | Ranunculus hyperboreus | Ranunculaceae
|
| RANE2 | Ranunculus nelsonii (DC.) Gray | Ranunculus occidentalis var. nelsonii | Ranunculaceae
|
| RANI3 | Ranunculus nitidus Muhl. ex Ell., non Walt. | Ranunculus hispidus var. nitidus | Ranunculaceae
|
| RANIE | Ranunculus nivalis L. var. eschscholtzii (Schlecht.) S. Wats. | Ranunculus eschscholtzii var. eschscholtzii | Ranunculaceae
|
| RANIS | Ranunculus nivalis L. var. sulphureus (Soland. ex C.J. Phipps) Wahlenb. | Ranunculus sulphureus | Ranunculaceae
|
| RANI | Ranunculus nivalis L. | snow buttercup | Ranunculaceae
|
| RAOB2 | Ranunculus oblongifolius Ell. | Ranunculus pusillus var. pusillus | Ranunculaceae
|
| RAOB | Ranunculus obtusiusculus Raf. | Ranunculus ambigens | Ranunculaceae
|
| RAOCI | Ranunculus occidentalis Nutt. ssp. insularis Hult�n | Ranunculus occidentalis var. nelsonii | Ranunculaceae
|
| RAOCN2 | Ranunculus occidentalis Nutt. ssp. nelsonii (DC.) Hult�n | Ranunculus occidentalis var. nelsonii | Ranunculaceae
|
| RAOCB | Ranunculus occidentalis Nutt. var. brevistylis Greene | western buttercup | Ranunculaceae
|
| RAOCD | Ranunculus occidentalis Nutt. var. dissectus Henderson | Ranunculus occidentalis var. occidentalis | Ranunculaceae
|
| RAOCE | Ranunculus occidentalis Nutt. var. eisenii Kellogg | Ranunculus occidentalis var. occidentalis | Ranunculaceae
|
| RAOCH | Ranunculus occidentalis Nutt. var. howellii (Greene) Greene | Ranunculus occidentalis var. occidentalis | Ranunculaceae
|
| RAOCN | Ranunculus occidentalis Nutt. var. nelsonii (DC.) L. Benson | Nelson's buttercup | Ranunculaceae
|
| RAOCO | Ranunculus occidentalis Nutt. var. occidentalis | western buttercup | Ranunculaceae
|
| RAOCP | Ranunculus occidentalis Nutt. var. parviflorus Torr. | Ranunculus uncinatus var. parviflorus | Ranunculaceae
|
| RAOCR | Ranunculus occidentalis Nutt. var. rattanii Gray | Ranunculus occidentalis var. occidentalis | Ranunculaceae
|
| RAOCT2 | Ranunculus occidentalis Nutt. var. turneri (Greene) L. Benson | Ranunculus turneri | Ranunculaceae
|
| RAOCT | Ranunculus occidentalis Nutt. var. typicus L. Benson | Ranunculus occidentalis var. occidentalis | Ranunculaceae
|
| RAOCU | Ranunculus occidentalis Nutt. var. ultramontanus Greene | Ranunculus occidentalis var. occidentalis | Ranunculaceae
|
| RAOC | Ranunculus occidentalis Nutt. | western buttercup | Ranunculaceae
|
| RAOR | Ranunculus oreogenes Greene | Oregon buttercup | Ranunculaceae
|
| RAOR2 | Ranunculus oresterus L. Benson | Blue Mountain buttercup | Ranunculaceae
|
| RAORA3 | Ranunculus orthorhynchus Hook. ssp. alaschensis (L. Benson) Hult�n | Ranunculus orthorhynchus var. orthorhynchus | Ranunculaceae
|
| RAORP2 | Ranunculus orthorhynchus Hook. ssp. platyphyllus (Gray) Taylor & MacBryde | Ranunculus orthorhynchus var. orthorhynchus | Ranunculaceae
|
| RAORA | Ranunculus orthorhynchus Hook. var. alaschensis L. Benson | Ranunculus orthorhynchus var. orthorhynchus | Ranunculaceae
|
| RAORA2 | Ranunculus orthorhynchus Hook. var. alpinus S. Wats. | Ranunculus adoneus var. alpinus | Ranunculaceae
|
| RAORB | Ranunculus orthorhynchus Hook. var. bloomeri (S. Wats.) L. Benson | Bloomer's buttercup | Ranunculaceae
|
| RAORH | Ranunculus orthorhynchus Hook. var. hallii Jepson | Ranunculus orthorhynchus var. orthorhynchus | Ranunculaceae
|
| RAORO | Ranunculus orthorhynchus Hook. var. orthorhynchus | straightbeak buttercup | Ranunculaceae
|
| RAORP | Ranunculus orthorhynchus Hook. var. platyphyllus Gray | Ranunculus orthorhynchus var. orthorhynchus | Ranunculaceae
|
| RAORT | Ranunculus orthorhynchus Hook. var. typicus L. Benson | Ranunculus orthorhynchus var. orthorhynchus | Ranunculaceae
|
| RAOR3 | Ranunculus orthorhynchus Hook. | straightbeak buttercup | Ranunculaceae
|
| RAOV2 | Ranunculus ovalis Raf. | Ranunculus rhomboideus | Ranunculaceae
|
| RAOX | Ranunculus oxynotus Gray | Ranunculus eschscholtzii var. oxynotus | Ranunculaceae
|
| RAPA | Ranunculus pacificus (Hult�n) L. Benson | Pacific buttercup | Ranunculaceae
|
| RAPA2 | Ranunculus pallasii Schlecht. | Pallas' buttercup | Ranunculaceae
|
| RAPA5 | Ranunculus palmatus Ell. | Ranunculus hispidus var. nitidus | Ranunculaceae
|
| RAPA3 | Ranunculus parviflorus L. | smallflower buttercup | Ranunculaceae
|
| RAPA6 | Ranunculus parvulus L. | Ranunculus sardous | Ranunculaceae
|
| RAPEA3 | Ranunculus pedatifidus Sm. ssp. affinis (R. Br.) Hult�n | Ranunculus pedatifidus var. affinis | Ranunculaceae
|
| RAPEA | Ranunculus pedatifidus Sm. var. affinis (R. Br.) L. Benson | northern buttercup | Ranunculaceae
|
| RAPEL | Ranunculus pedatifidus Sm. var. leiocarpus (Trautv.) Fern. | Ranunculus pedatifidus var. affinis | Ranunculaceae
|
| RAPE | Ranunculus pedatifidus Sm. | surefoot buttercup | Ranunculaceae
|
| RAPE2 | Ranunculus pensylvanicus L. f. | Pennsylvania buttercup | Ranunculaceae
|
| RAPEA2 | Ranunculus petiolaris Kunth ex DC. var. arsenei (L. Benson) T. Duncan | Arsene's buttercup | Ranunculaceae
|
| RAPE5 | Ranunculus petiolaris Kunth ex DC. | Latin American buttercup | Ranunculaceae
|
| RAPL | Ranunculus platensis Spreng. | prairie buttercup | Ranunculaceae
|
| RAPL2 | Ranunculus plebeius R. Br. ex DC. | common Australian buttercup | Ranunculaceae
|
| RAPO | Ranunculus populago Greene | popular buttercup | Ranunculaceae
|
| RAPU3 | Ranunculus purshii Richards. | Ranunculus gmelinii | Ranunculaceae
|
| RAPUA | Ranunculus pusillus Poir. var. angustifolius (Engelm.) L. Benson | low spearwort | Ranunculaceae
|
| RAPUL | Ranunculus pusillus Poir. var. lindheimeri (Engelm.) Gray | Ranunculus pusillus var. pusillus | Ranunculaceae
|
| RAPUP | Ranunculus pusillus Poir. var. pusillus | low spearwort | Ranunculaceae
|
| RAPUT | Ranunculus pusillus Poir. var. trachyspermus Engelm. | Ranunculus pusillus var. angustifolius | Ranunculaceae
|
| RAPUT2 | Ranunculus pusillus Poir. var. typicus L. Benson | Ranunculus pusillus var. pusillus | Ranunculaceae
|
| RAPU | Ranunculus pusillus Poir. | low spearwort | Ranunculaceae
|
| RAPYS | Ranunculus pygmaeus Wahlenb. ssp. sabinei (R. Br.) Hult�n | Ranunculus sabinei | Ranunculaceae
|
| RAPY | Ranunculus pygmaeus Wahlenb. | pygmy buttercup | Ranunculaceae
|
| RARA | Ranunculus ranunculinus (Nutt.) Rydb. | tadpole buttercup | Ranunculaceae
|
| RARE5 | Ranunculus reconditus A. Nels. & J.F. Macbr. | Ranunculus triternatus | Ranunculaceae
|
| RAREA | Ranunculus recurvatus Poir. var. adpressipilis Weatherby | Ranunculus recurvatus var. recurvatus | Ranunculaceae
|
| RAREN | Ranunculus recurvatus Poir. var. nelsonii DC. | Ranunculus occidentalis var. nelsonii | Ranunculaceae
|
| RARER2 | Ranunculus recurvatus Poir. var. recurvatus | blisterwort | Ranunculaceae
|
| RARET2 | Ranunculus recurvatus Poir. var. tropicus (Griseb.) Fawcett & Rendle | blisterwort | Ranunculaceae
|
| RARET | Ranunculus recurvatus Poir. var. typicus L. Benson | Ranunculus recurvatus var. recurvatus | Ranunculaceae
|
| RARE2 | Ranunculus recurvatus Poir. | blisterwort | Ranunculaceae
|
| RARED | Ranunculus repens L. var. degeneratus Schur | Ranunculus repens | Ranunculaceae
|
| RAREE | Ranunculus repens L. var. erectus DC. | Ranunculus repens | Ranunculaceae
|
| RAREG | Ranunculus repens L. var. glabratus DC. | Ranunculus repens | Ranunculaceae
|
| RAREL | Ranunculus repens L. var. linearilobus DC. | Ranunculus repens | Ranunculaceae
|
| RAREP | Ranunculus repens L. var. pleniflorus Fern. | Ranunculus repens | Ranunculaceae
|
| RARET3 | Ranunculus repens L. var. typicus G. Beck | Ranunculus repens | Ranunculaceae
|
| RAREV | Ranunculus repens L. var. villosus Lamotte | Ranunculus repens | Ranunculaceae
|
| RARE3 | Ranunculus repens L. | creeping buttercup | Ranunculaceae
|
| RAREF | Ranunculus reptans L. var. filiformis (Michx.) DC. | Ranunculus flammula var. filiformis | Ranunculaceae
|
| RAREI | Ranunculus reptans L. var. intermedius (Hook.) Torr. & Gray | Ranunculus flammula var. filiformis | Ranunculaceae
|
| RAREO | Ranunculus reptans L. var. ovalis (Bigelow) Torr. & Gray | Ranunculus flammula var. flammula | Ranunculaceae
|
| RARE80 | Ranunculus reptans L. | Ranunculus flammula var. filiformis | Ranunculaceae
|
| RARH | Ranunculus rhomboideus Goldie | Labrador buttercup | Ranunculaceae
|
| RARU2 | Ranunculus rugulosus Greene | Ranunculus californicus | Ranunculaceae
|
| RASA4 | Ranunculus sabinei R. Br. | Sardinian buttercup | Ranunculaceae
|
| RASA | Ranunculus sardous Crantz | hairy buttercup | Ranunculaceae
|
| RASCM3 | Ranunculus sceleratus L. ssp. multifidus (Nutt.) Hult�n | Ranunculus sceleratus var. multifidus | Ranunculaceae
|
| RASCM | Ranunculus sceleratus L. var. multifidus Nutt. | cursed buttercup | Ranunculaceae
|
| RASCS | Ranunculus sceleratus L. var. sceleratus | cursed buttercup | Ranunculaceae
|
| RASCT | Ranunculus sceleratus L. var. typicus L. Benson | Ranunculus sceleratus var. sceleratus | Ranunculaceae
|
| RASC3 | Ranunculus sceleratus L. | cursed buttercup | Ranunculaceae
|
| RASEP2 | Ranunculus septentrionalis Poir. ssp. pacificus Hult�n | Ranunculus pacificus | Ranunculaceae
|
| RASEC | Ranunculus septentrionalis Poir. var. caricetorum (Greene) Fern. | Ranunculus hispidus var. caricetorum | Ranunculaceae
|
| RASEN | Ranunculus septentrionalis Poir. var. nitidus Chapman | Ranunculus hispidus var. nitidus | Ranunculaceae
|
| RASEP | Ranunculus septentrionalis Poir. var. pterocarpus L. Benson | Ranunculus hispidus var. nitidus | Ranunculaceae
|