| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| RUNUG | Ruellia nudiflora (Engelm. & Gray) Urban var. glabrata Leonard | Ruellia nudiflora var. nudiflora | Acanthaceae
|
| RUNUH | Ruellia nudiflora (Engelm. & Gray) Urban var. hispidula Shinners | Ruellia nudiflora var. nudiflora | Acanthaceae
|
| RUNUH2 | Ruellia nudiflora (Engelm. & Gray) Urban var. humilis (Nees) Leonard | Ruellia drushelii var. drushelii | Acanthaceae
|
| RUNUN | Ruellia nudiflora (Engelm. & Gray) Urban var. nudiflora | violet wild petunia | Acanthaceae
|
| RUNUO | Ruellia nudiflora (Engelm. & Gray) Urban var. occidentalis (Gray) Leonard | Ruellia occidentalis | Acanthaceae
|
| RUNUR | Ruellia nudiflora (Engelm. & Gray) Urban var. runyonii (Tharp & Barkl.) B.L. Turner | Runyon's wild petunia | Acanthaceae
|
| RUNUY | Ruellia nudiflora (Engelm. & Gray) Urban var. yucatana Leonard | Ruellia yucatana | Acanthaceae
|
| RUNU | Ruellia nudiflora (Engelm. & Gray) Urban | violet wild petunia | Acanthaceae
|
| RUOB5 | Ruellia oblongifolia Michx. | Dyschoriste oblongifolia | Acanthaceae
|
| RUOC4 | Ruellia occidentalis (Gray) Tharp & Barkl. | western wild petunia | Acanthaceae
|
| RUPA3 | Ruellia parryi Gray | Parry's wild petunia | Acanthaceae
|
| RUPA21 | Ruellia parviflora (Nees) Britt. | Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Acanthaceae
|
| RUPA26 | Ruellia patula Jacq. | | Acanthaceae
|
| RUPEP2 | Ruellia pedunculata Torr. ex Gray ssp. pedunculata | stalked wild petunia | Acanthaceae
|
| RUPEP | Ruellia pedunculata Torr. ex Gray ssp. pinetorum (Fern.) R.W. Long | stalked wild petunia | Acanthaceae
|
| RUPE4 | Ruellia pedunculata Torr. ex Gray | stalked wild petunia | Acanthaceae
|
| RUPI2 | Ruellia pinetorum Fern. | Ruellia pedunculata ssp. pinetorum | Acanthaceae
|
| RUPR18 | Ruellia prostrata Poir. | prostrate wild petunia | Acanthaceae
|
| RUPU2 | Ruellia purshiana Fern. | Pursh's wild petunia | Acanthaceae
|
| RURE7 | Ruellia reptans Forst. f. | Hemigraphis reptans | Acanthaceae
|
| RURUB | Ruellia runyonii Tharp & Barkl. var. berlandieri Tharp & Barkl. | Ruellia nudiflora var. runyonii | Acanthaceae
|
| RURU | Ruellia runyonii Tharp & Barkl. | Ruellia nudiflora var. runyonii | Acanthaceae
|
| RUSTC | Ruellia strepens L. var. cleistantha Gray | Ruellia strepens | Acanthaceae
|
| RUSTM | Ruellia strepens L. var. micrantha (Engelm. & Gray) Britt. | Ruellia strepens | Acanthaceae
|
| RUST2 | Ruellia strepens L. | limestone wild petunia | Acanthaceae
|
| RUST8 | Ruellia strictopaniculata Tharp & Barkl. | Ruellia occidentalis | Acanthaceae
|
| RUSU6 | Ruellia succulenta Small | Ruellia caroliniensis ssp. caroliniensis var. succulenta | Acanthaceae
|
| RUTUO | Ruellia tuberosa L. var. occidentalis Gray | Ruellia occidentalis | Acanthaceae
|
| RUTU | Ruellia tuberosa L. | minnieroot | Acanthaceae
|
| RUTU3 | Ruellia tuberosa sensu Gray | Ruellia nudiflora var. nudiflora | Acanthaceae
|
| RUTW | Ruellia tweediana auct. non Griseb. | Ruellia brittoniana | Acanthaceae
|
| RUYU | Ruellia yucatana (Leonard) Tharp & Barkl. | Yucatan wild petunia | Acanthaceae
|
| RUELL | Ruellia L. | wild petunia | Acanthaceae
|
| RUCA7 | Rufacer carolinianum (Walt.) Small | Acer rubrum var. trilobum | Aceraceae
|
| RUDR3 | Rufacer drummondii (Hook. & Arn. ex Nutt.) Small | Acer rubrum var. drummondii | Aceraceae
|
| RURU5 | Rufacer rubrum (L.) Small | Acer rubrum var. rubrum | Aceraceae
|
| RUNU2 | Rugelia nudicaulis Shuttlw. ex Chapman | Rugel's Indianplantain | Asteraceae
|
| RUGEL | Rugelia Shuttlw. ex Chapman | Rugel's Indianplantain | Asteraceae
|
| RUACA | Rumex acetosa L. ssp. acetosa | garden sorrel | Polygonaceae
|
| RUACA2 | Rumex acetosa L. ssp. alpestris (Jacq.) A. L�ve | garden sorrel | Polygonaceae
|
| RUACP | Rumex acetosa L. ssp. pseudoxyria Tolm. | garden sorrel | Polygonaceae
|
| RUACT | Rumex acetosa L. ssp. thyrsiflorus (Fingerhuth) Hayek | garden sorrel | Polygonaceae
|
| RUAC2 | Rumex acetosa L. | garden sorrel | Polygonaceae
|
| RUACA5 | Rumex acetosella L. ssp. angiocarpus (Murb.) Murb. | Rumex acetosella | Polygonaceae
|
| RUACP2 | Rumex acetosella L. var. pyrenaeus (Pourret) Timbal-Lagrave | Rumex acetosella | Polygonaceae
|
| RUACT2 | Rumex acetosella L. var. tenuifolius Wallr. | Rumex acetosella | Polygonaceae
|
| RUAC3 | Rumex acetosella L. | common sheep sorrel | Polygonaceae
|
| RUAC6 | Rumex �acutus L. (pro sp.) | | Polygonaceae
|
| RUAL5 | Rumex albescens Hbd. | Oahu dock | Polygonaceae
|
| RUAL11 | Rumex alpestris Jacq. | Rumex acetosa ssp. alpestris | Polygonaceae
|
| RUAL3 | Rumex alpinus L. | Munk's rhubarb | Polygonaceae
|
| RUAL4 | Rumex altissimus Wood | pale dock | Polygonaceae
|
| RUAN | Rumex angiocarpus Murb. | Rumex acetosella | Polygonaceae
|
| RUAQF2 | Rumex aquaticus L. ssp. fenestratus (Greene) Hult�n | Rumex aquaticus var. fenestratus | Polygonaceae
|
| RUAQO | Rumex aquaticus L. ssp. occidentalis (S. Wats.) Hult�n | Rumex aquaticus var. fenestratus | Polygonaceae
|
| RUAQF | Rumex aquaticus L. var. fenestratus (Greene) Dorn | western dock | Polygonaceae
|
| RUAQ | Rumex aquaticus L. | western dock | Polygonaceae
|
| RUARA | Rumex arcticus Trautv. var. arcticus | arctic dock | Polygonaceae
|
| RUARP | Rumex arcticus Trautv. var. perlatus Hult�n | arctic dock | Polygonaceae
|
| RUAR6 | Rumex arcticus Trautv. | arctic dock | Polygonaceae
|
| RUBE4 | Rumex beringensis Jurtzev & Petrovsky | Bering Sea dock | Polygonaceae
|
| RUBE6 | Rumex berlandieri Meisn. | Rumex chrysocarpus | Polygonaceae
|
| RUBR4 | Rumex britannica Amer. auct. non L. | Rumex orbiculatus var. borealis | Polygonaceae
|
| RUBR3 | Rumex brittanicus Meisn., non L. | Rumex altissimus | Polygonaceae
|
| RUBR2 | Rumex brownei Campd. | Browne's dock | Polygonaceae
|
| RUBU3 | Rumex bucephalophorus L. | red dock | Polygonaceae
|
| RUCA8 | Rumex californicus Rech. f. | Rumex salicifolius var. denticulatus | Polygonaceae
|
| RUCH3 | Rumex chrysocarpus Moris | amamastla | Polygonaceae
|
| RUCO7 | Rumex �confusus Simonkai | | Polygonaceae
|
| RUCO2 | Rumex conglomeratus Murr. | clustered dock | Polygonaceae
|
| RUCR4 | Rumex crassus Rech. f. | Rumex salicifolius var. crassus | Polygonaceae
|
| RUCR3 | Rumex �crispobtusifolius Meisn. | Rumex acutus | Polygonaceae
|
| RUCRC | Rumex crispus L. ssp. crispus | curly dock | Polygonaceae
|
| RUCRF | Rumex crispus L. ssp. fauriei (Rech. f.) Mosyakin and W.L. Wagner | curly dock | Polygonaceae
|
| RUCR | Rumex crispus L. | curly dock | Polygonaceae
|
| RUCR2 | Rumex cristatus DC. | Greek dock | Polygonaceae
|
| RUCU2 | Rumex cuneifolius Campd. | Rumex frutescens | Polygonaceae
|
| RUDE2 | Rumex densiflorus Osterhout | denseflowered dock | Polygonaceae
|
| RUDEK | Rumex dentatus L. ssp. klotzschianus (Meisn.) Rech. f. | Rumex dentatus | Polygonaceae
|
| RUDE3 | Rumex dentatus L. | toothed dock | Polygonaceae
|
| RUDI4 | Rumex digyna L. | Oxyria digyna | Polygonaceae
|
| RUDI12 | Rumex �dissimilis Rech. f. (pro sp.) | | Polygonaceae
|
| RUDO | Rumex domesticus Hartman | Rumex longifolius | Polygonaceae
|
| RUEL6 | Rumex ellipticus Greene | Rumex altissimus | Polygonaceae
|
| RUFA | Rumex fascicularis Small | Rumex verticillatus | Polygonaceae
|
| RUFA6 | Rumex fauriei Rech. f. | Rumex crispus ssp. fauriei | Polygonaceae
|
| RUFE3 | Rumex fenestratus Greene | Rumex aquaticus var. fenestratus | Polygonaceae
|
| RUFE4 | Rumex fennicus (Murb.) Murb. | Rumex pseudonatronatus | Polygonaceae
|
| RUFL2 | Rumex floridanus Meisn. | Rumex verticillatus | Polygonaceae
|
| RUFR7 | Rumex frutescens Thouars | wedgeleaf dock | Polygonaceae
|
| RUFU3 | Rumex fueginus Phil. | Rumex maritimus | Polygonaceae
|
| RUGIN | Rumex giganteus Ait. var. nelsonii O.& I. Deg. | Rumex giganteus | Polygonaceae
|
| RUGI | Rumex giganteus Ait. | pawale | Polygonaceae
|
| RUGR2 | Rumex graminifolius J.H. Rudolphi ex Lamb. | grassleaf sorrel | Polygonaceae
|
| RUHA2 | Rumex hastatulus Baldw. | heartwing sorrel | Polygonaceae
|
| RUHE6 | Rumex hesperis Greene | Rumex salicifolius var. denticulatus | Polygonaceae
|
| RUHYE | Rumex hymenosepalus Torr. var. euhymenosepalus Rech. f. | Rumex hymenosepalus | Polygonaceae
|
| RUHYS | Rumex hymenosepalus Torr. var. salinus (A. Nels.) Rech. f. | Rumex hymenosepalus | Polygonaceae
|
| RUHY | Rumex hymenosepalus Torr. | canaigre dock | Polygonaceae
|
| RUKE | Rumex kerneri Borb�s | Kerner's dock | Polygonaceae
|
| RUKR | Rumex krausei Jurtzev & Petrovsky | Krause's sorrel | Polygonaceae
|