| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| RHCR6 | Rhabdoweisia crenulata (Mitt.) Jameson | crenulate rhabdoweisia moss | Dicranaceae
|
| RHCR7 | Rhabdoweisia crispata (With.) Lindb. | rhabdoweisia moss | Dicranaceae
|
| RHDE4 | Rhabdoweisia denticulata Bruch & Schimp. in B.S.G. | Rhabdoweisia crispata | Dicranaceae
|
| RHABD2 | Rhabdoweisia Bruch & Schimp. in B.S.G. | rhabdoweisia moss | Dicranaceae
|
| RHPE10 | Rhachithecium perpusillum (Thwaites & Mitt. in Mitt.) Broth. | rhachithecium moss | Rhachitheciaceae
|
| RHACH | Rhachithecium Broth. ex Le Jolis | rhachithecium moss | Rhachitheciaceae
|
| RHCR4 | Rhacoma crossopetalum L. | Crossopetalum rhacoma | Celastraceae
|
| RHIL2 | Rhacoma ilicifolia (Poir.) Trel. | Crossopetalum ilicifolium | Celastraceae
|
| RHED3 | Rhagadiolus edulis Gaertn. | Rhagadiolus stellatus | Asteraceae
|
| RHST3 | Rhagadiolus stellatus (L.) Gaertn. | endive daisy | Asteraceae
|
| RHAGA | Rhagadiolus Juss. | rhagadiolus | Asteraceae
|
| RHAL | Rhamnus alnifolia L'H�r. | alderleaf buckthorn | Rhamnaceae
|
| RHARV | Rhamnus arguta Maxim. var. velutina Hand.-Maz. | | Rhamnaceae
|
| RHAR6 | Rhamnus arguta Maxim. | | Rhamnaceae
|
| RHBEO | Rhamnus betulifolia Greene var. obovata Kearney & Peebles | Frangula betulifolia ssp. obovata | Rhamnaceae
|
| RHBE | Rhamnus betulifolia Greene | Frangula betulifolia ssp. betulifolia | Rhamnaceae
|
| RHBL2 | Rhamnus blumeri Greene | Frangula blumeri | Rhamnaceae
|
| RHCAC | Rhamnus californica Eschsch. ssp. crassifolia (Jepson) C.B. Wolf | Frangula californica ssp. crassifolia | Rhamnaceae
|
| RHCAC2 | Rhamnus californica Eschsch. ssp. cuspidata (Greene) C.B. Wolf | Frangula californica ssp. cuspidata | Rhamnaceae
|
| RHCAO | Rhamnus californica Eschsch. ssp. occidentalis (T.J. Howell) C.B. Wolf | Frangula californica ssp. occidentalis | Rhamnaceae
|
| RHCAT | Rhamnus californica Eschsch. ssp. tomentella (Benth.) C.B. Wolf | Frangula californica ssp. tomentella | Rhamnaceae
|
| RHCAU2 | Rhamnus californica Eschsch. ssp. ursina (Greene) C.B. Wolf | Frangula californica ssp. ursina | Rhamnaceae
|
| RHCAO2 | Rhamnus californica Eschsch. var. occidentalis (T.J. Howell) Jepson | Frangula californica ssp. occidentalis | Rhamnaceae
|
| RHCAU3 | Rhamnus californica Eschsch. var. ursina (Greene) McMinn | Frangula californica ssp. ursina | Rhamnaceae
|
| RHCA | Rhamnus californica Eschsch. | Frangula californica ssp. californica | Rhamnaceae
|
| RHCAM | Rhamnus caroliniana Walt. var. mollis Fern. | Frangula caroliniana | Rhamnaceae
|
| RHCA2 | Rhamnus caroliniana Walt. | Frangula caroliniana | Rhamnaceae
|
| RHCA3 | Rhamnus cathartica L. | common buckthorn | Rhamnaceae
|
| RHCI5 | Rhamnus citrifolia (Weston) Hess & Stern non Rusby | Rhamnus davurica ssp. davurica | Rhamnaceae
|
| RHCRC | Rhamnus crocea Nutt. ssp. crocea | redberry buckthorn | Rhamnaceae
|
| RHCRI2 | Rhamnus crocea Nutt. ssp. ilicifolia (Kellogg) C.B. Wolf | Rhamnus ilicifolia | Rhamnaceae
|
| RHCRP2 | Rhamnus crocea Nutt. ssp. pilosa (Trel.) C.B. Wolf | hollyleaf buckthorn | Rhamnaceae
|
| RHCRP4 | Rhamnus crocea Nutt. ssp. pirifolia (Greene) C.B. Wolf | Rhamnus pirifolia | Rhamnaceae
|
| RHCRI3 | Rhamnus crocea Nutt. var. ilicifolia (Kellogg) Greene | Rhamnus ilicifolia | Rhamnaceae
|
| RHCRP3 | Rhamnus crocea Nutt. var. pirifolia (Greene) Little | Rhamnus pirifolia | Rhamnaceae
|
| RHCR | Rhamnus crocea Nutt. | redberry buckthorn | Rhamnaceae
|
| RHDAD2 | Rhamnus davurica Pallas ssp. davurica | Dahurian buckthorn | Rhamnaceae
|
| RHDAN2 | Rhamnus davurica Pallas ssp. nipponica (Makino) Kartesz & Gandhi | Dahurian buckthorn | Rhamnaceae
|
| RHDAN | Rhamnus davurica Pallas var. nipponica Makino | Rhamnus davurica ssp. nipponica | Rhamnaceae
|
| RHDA | Rhamnus davurica Pallas | Dahurian buckthorn | Rhamnaceae
|
| RHFA2 | Rhamnus fasciculata Greene | Rhamnus serrata | Rhamnaceae
|
| RHFE2 | Rhamnus ferreus Vahl | Krugiodendron ferreum | Rhamnaceae
|
| RHFRA | Rhamnus frangula L. var. angustifolia Loud. | Frangula alnus | Rhamnaceae
|
| RHFR | Rhamnus frangula L. | Frangula alnus | Rhamnaceae
|
| RHGL7 | Rhamnus globosus Bunge | lokao | Rhamnaceae
|
| RHIL | Rhamnus ilicifolia Kellogg | hollyleaf redberry | Rhamnaceae
|
| RHJA8 | Rhamnus japonica Maxim. | Japanese buckthorn | Rhamnaceae
|
| RHLAG2 | Rhamnus lanceolata Pursh ssp. glabrata (Gleason) Kartesz & Gandhi | lanceleaf buckthorn | Rhamnaceae
|
| RHLAL3 | Rhamnus lanceolata Pursh ssp. lanceolata | lanceleaf buckthorn | Rhamnaceae
|
| RHLAG | Rhamnus lanceolata Pursh var. glabrata Gleason | Rhamnus lanceolata ssp. glabrata | Rhamnaceae
|
| RHLA | Rhamnus lanceolata Pursh | lanceleaf buckthorn | Rhamnaceae
|
| RHMI12 | Rhamnus minutiflora Michx. | Sageretia minutiflora | Rhamnaceae
|
| RHPA8 | Rhamnus paliurus L. | Paliurus spina-christi | Rhamnaceae
|
| RHPI4 | Rhamnus pilosa (Trel.) Abrams | Rhamnus crocea ssp. pilosa | Rhamnaceae
|
| RHPI | Rhamnus pirifolia Greene | island redberry | Rhamnaceae
|
| RHPU | Rhamnus purshiana DC. | Frangula purshiana | Rhamnaceae
|
| RHRUM | Rhamnus rubra Greene ssp. modocensis C.B. Wolf | Frangula rubra ssp. modocensis | Rhamnaceae
|
| RHRUN | Rhamnus rubra Greene ssp. nevadensis (A. Nels.) C.B. Wolf | Frangula rubra ssp. nevadensis | Rhamnaceae
|
| RHRUO | Rhamnus rubra Greene ssp. obtusissima (Greene) C.B. Wolf | Frangula rubra ssp. obtusissima | Rhamnaceae
|
| RHRUY | Rhamnus rubra Greene ssp. yosemitana C.B. Wolf | Frangula rubra ssp. yosemitana | Rhamnaceae
|
| RHRU | Rhamnus rubra Greene | Frangula rubra ssp. rubra | Rhamnaceae
|
| RHSE3 | Rhamnus serrata Humb. & Bonpl. ex J.A. Schultes | sawleaf buckthorn | Rhamnaceae
|
| RHSMF | Rhamnus smithii Greene ssp. fasciculata (Greene) C.B. Wolf | Rhamnus serrata | Rhamnaceae
|
| RHSMT | Rhamnus smithii Greene ssp. typica C.B. Wolf | Rhamnus smithii | Rhamnaceae
|
| RHSM | Rhamnus smithii Greene | Smith's buckthorn | Rhamnaceae
|
| RHSPL | Rhamnus sphaerosperma Sw. var. longipes M.C. & L.A. Johnston | Frangula sphaerosperma ssp. longipes | Rhamnaceae
|
| RHTOC | Rhamnus tomentella Benth. ssp. crassifolia (Jepson) J.O. Sayer | Frangula californica ssp. crassifolia | Rhamnaceae
|
| RHTOC2 | Rhamnus tomentella Benth. ssp. cuspidata (Greene) J.O. Sayer | Frangula californica ssp. cuspidata | Rhamnaceae
|
| RHTOU | Rhamnus tomentella Benth. ssp. ursina (Greene) J.O. Sayer | Frangula californica ssp. ursina | Rhamnaceae
|
| RHTO6 | Rhamnus tomentella Benth. | Frangula californica ssp. tomentella | Rhamnaceae
|
| RHUT80 | Rhamnus utilis Dcne. | Chinese buckthorn | Rhamnaceae
|
| RHAMN | Rhamnus L. | buckthorn | Rhamnaceae
|
| RHCY5 | Rhaphidostegium cylindricarpum (C. M�ll.) Mac. & Kindb. | Pylaisiadelpha tenuirostris | Hypnaceae
|
| RHDE5 | Rhaphidostegium demissum (Wils.) De Not. | Sematophyllum demissum | Sematophyllaceae
|
| RHJA6 | Rhaphidostegium jamesii (Sull.) Lesq. & James | Hypnum pallescens var. protuberans | Hypnaceae
|
| RHLA10 | Rhaphidostegium laxepatulum (Lesq. & James) Ren. & Card. | Brotherella recurvans | Sematophyllaceae
|
| RHMI15 | Rhaphidostegium microcarpon (Brid.) Jaeg. | Sematophyllum adnatum | Sematophyllaceae
|
| RHNO2 | Rhaphidostegium novae-caesareae (Aust.) Kindb. | Hygrohypnum micans | Amblystegiaceae
|
| RHRE6 | Rhaphidostegium recurvans (Michx.) Jaeg. | Brotherella recurvans | Sematophyllaceae
|
| RHRO8 | Rhaphidostegium roellii Ren. & Card. in R�ll | Brotherella roellii | Sematophyllaceae
|
| RHSU9 | Rhaphidostegium subadnatum C. M�ll. & Kindb. in Mac. & Kindb. | Hypnum pallescens var. pallescens | Hypnaceae
|
| RHPA5 | Rhaphis pauciflora (Chapman) Nash | Chrysopogon pauciflorus | Poaceae
|
| RHHY | Rhapidophyllum hystrix (Pursh) H. Wendl. & Drude ex Drude | needle palm | Arecaceae
|
| RHAPI | Rhapidophyllum H. Wendl. & Drude ex Drude | rhapidophyllum | Arecaceae
|
| RHAC2 | Rheedia acuminata (Spreng.) Triana & Planch. | Garcinia portoricensis | Clusiaceae
|
| RHHE | Rheedia hessii Britt. | Garcinia hessii | Clusiaceae
|
| RHMA11 | Rheedia madruno (Kunth) Planchon & Triana | Garcinia portoricensis | Clusiaceae
|
| RHPO | Rheedia portoricensis Urban | Garcinia portoricensis | Clusiaceae
|
| RHOF | Rheum officinale Baillon | Chinese rhubarb | Polygonaceae
|
| RHPA7 | Rheum palmatum L. | Chinese rhubarb | Polygonaceae
|
| RHRH2 | Rheum rhabarbarum L. | garden rhubarb | Polygonaceae
|
| RHEUM | Rheum L. | rhubarb | Polygonaceae
|
| RHAL4 | Rhexia alifanus Walt. | savannah meadowbeauty | Melastomataceae
|
| RHAR | Rhexia aristosa Britt. | awnpetal meadowbeauty | Melastomataceae
|
| RHBR6 | Rhexia �brevibracteata D. Snyder | | Melastomataceae
|
| RHCI6 | Rhexia ciliosa Michx. | Rhexia petiolata | Melastomataceae
|
| RHCU4 | Rhexia cubensis Griseb. | West Indian meadowbeauty | Melastomataceae
|
| RHDE3 | Rhexia delicatula Small | Rhexia mariana var. mariana | Melastomataceae
|
| RHFI3 | Rhexia filiformis Small | Rhexia mariana var. mariana | Melastomataceae
|
| RHGL5 | Rhexia glabella Michx. | Rhexia alifanus | Melastomataceae
|
| RHIN9 | Rhexia interior Pennell | Rhexia mariana var. interior | Melastomataceae
|