| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| RHPE8 | Rhizocarpon petraeum (Wulfen) A. Massal. | map lichen | Rhizocarpaceae
|
| RHPL7 | Rhizocarpon plicatile (Leighton) A. L. Sm. | map lichen | Rhizocarpaceae
|
| RHPO5 | Rhizocarpon polare Rasanen | Rhizocarpon superficiale | Rhizocarpaceae
|
| RHPO4 | Rhizocarpon polycarpoides Degel. | map lichen | Rhizocarpaceae
|
| RHPO60 | Rhizocarpon polycarpum (Hepp.) Th. Fr. | map lichen | Rhizocarpaceae
|
| RHPO6 | Rhizocarpon postumum (Nyl.) Arnold | map lichen | Rhizocarpaceae
|
| RHPR5 | Rhizocarpon praebadium (Nyl.) Zahlbr. | map lichen | Rhizocarpaceae
|
| RHPU6 | Rhizocarpon pusillum Runem. | map lichen | Rhizocarpaceae
|
| RHRE4 | Rhizocarpon reductum Th. Fr. | Rhizocarpon obscuratum | Rhizocarpaceae
|
| RHRE5 | Rhizocarpon renneri Poelt | Renner's map lichen | Rhizocarpaceae
|
| RHRI3 | Rhizocarpon riparium Rasanen | streamside map lichen | Rhizocarpaceae
|
| RHRI4 | Rhizocarpon rittokense (Hellbom) Th. Fr. | Rittok map lichen | Rhizocarpaceae
|
| RHSA5 | Rhizocarpon saanaense Rasanen | map lichen | Rhizocarpaceae
|
| RHSA6 | Rhizocarpon santessonii Timdal | Santesson's map lichen | Rhizocarpaceae
|
| RHSI2 | Rhizocarpon simillimum (Anzi) Lettau | map lichen | Rhizocarpaceae
|
| RHSP6 | Rhizocarpon sphaerosporum Rasanen | Rhizocarpon macrosporum | Rhizocarpaceae
|
| RHSU2 | Rhizocarpon subgeminatum Eitner | map lichen | Rhizocarpaceae
|
| RHSU5 | Rhizocarpon sublucidum Rasanen | Rhizocarpon saanaense | Rhizocarpaceae
|
| RHSU3 | Rhizocarpon submodestum (Vainio) Vainio | map lichen | Rhizocarpaceae
|
| RHSU6 | Rhizocarpon subtile Runem. | Rhizocarpon viridiatrum | Rhizocarpaceae
|
| RHSUB | Rhizocarpon superficiale (Schaerer) Vainio ssp. boreale Runem. | boreal map lichen | Rhizocarpaceae
|
| RHSU4 | Rhizocarpon superficiale (Schaerer) Vainio | superficial map lichen | Rhizocarpaceae
|
| RHTE6 | Rhizocarpon tetramerum (Vainio) Vainio | map lichen | Rhizocarpaceae
|
| RHUM | Rhizocarpon umbilicatum (Ramond) Flagey | map lichen | Rhizocarpaceae
|
| RHVE5 | Rhizocarpon vernicomoideum Fink | map lichen | Rhizocarpaceae
|
| RHVI5 | Rhizocarpon viridiatrum (Wulfen) Korber | map lichen | Rhizocarpaceae
|
| RHIZO3 | Rhizocarpon Ramond ex DC. | map lichen | Rhizocarpaceae
|
| RHSP7 | Rhizogonium spiniforme (Hedw.) Bruch in Kraus | Pyrrhobryum spiniforme | Rhizogoniaceae
|
| RHAN70 | Rhizomnium andrewsianum (Steere) T. Kop. | Andrews' rhizomnium moss | Mniaceae
|
| RHAP | Rhizomnium appalachianum T. Kop. | Appalachian rhizomnium moss | Mniaceae
|
| RHGL70 | Rhizomnium glabrescens (Kindb.) T. Kop. | rhizomnium moss | Mniaceae
|
| RHGR5 | Rhizomnium gracile T. Kop. | rhizomnium moss | Mniaceae
|
| RHMA12 | Rhizomnium magnifolium (Horik.) T. Kop. | grandleaf rhizomnium moss | Mniaceae
|
| RHNU4 | Rhizomnium nudum (Britt. & Williams) T. Kop. | naked rhizomnium moss | Mniaceae
|
| RHPE11 | Rhizomnium perssonii T. Kop | Rhizomnium magnifolium | Mniaceae
|
| RHPS70 | Rhizomnium pseudopunctatum (Bruch & Schimp.) T. Kop. | rhizomnium moss | Mniaceae
|
| RHPUC | Rhizomnium punctatum (Hedw.) T. Kop. ssp. chlorophyllosum (Kindb.) T. Kop. | Rhizomnium punctatum | Mniaceae
|
| RHPUE | Rhizomnium punctatum (Hedw.) T. Kop. var. elatum (Schimp.) T. Kop. | Rhizomnium magnifolium | Mniaceae
|
| RHPU7 | Rhizomnium punctatum (Hedw.) T. Kop. | rhizomnium moss | Mniaceae
|
| RHIZO2 | Rhizomnium (Broth.) T. Kop. | rhizomnium moss | Mniaceae
|
| RHAP2 | Rhizophora apiculata Blume | mangrove | Rhizophoraceae
|
| RHMA2 | Rhizophora mangle L. | American mangrove | Rhizophoraceae
|
| RHMU | Rhizophora mucronata Lam. | mangrove | Rhizophoraceae
|
| RHIZO | Rhizophora L. | mangrove | Rhizophoraceae
|
| RHCH61 | Rhizoplaca chrysoleuca (Sm.) Zopf | golden rimmed navel lichen | Lecanoraceae
|
| RHGL6 | Rhizoplaca glaucophana (Nyl. ex Hasse) W. A. Weber | rimmed navel lichen | Lecanoraceae
|
| RHHA3 | Rhizoplaca haydenii (Tuck.) W. A. Weber | Hayden's rimmed navel lichen | Lecanoraceae
|
| RHMA10 | Rhizoplaca marginalis (Hasse) W. A. Weber | rimmed navel lichen | Lecanoraceae
|
| RHME2 | Rhizoplaca melanophthalma (DC.) Leuckert & Poelt | rimmed navel lichen | Lecanoraceae
|
| RHPE6 | Rhizoplaca peltata (Ramond) Leuckert & Poelt | peltate rimmed navel lichen | Lecanoraceae
|
| RHSU13 | Rhizoplaca subdiscrepans (Nyl.) R. Sant. | rimmed navel lichen | Lecanoraceae
|
| RHIZO4 | Rhizoplaca Zopf | rimmed navel lichen | Lecanoraceae
|
| RHINI | Rhodiola integrifolia Raf. ssp. integrifolia | ledge stonecrop | Crassulaceae
|
| RHINL | Rhodiola integrifolia Raf. ssp. leedyi (Rosendahl & Moore) Kartesz, comb. nov. ined. | Leedy's stonecrop | Crassulaceae
|
| RHINN | Rhodiola integrifolia Raf. ssp. neomexicana (Britt.) Kartesz, comb. nov. ined. | New Mexican stonecrop | Crassulaceae
|
| RHINP | Rhodiola integrifolia Raf. ssp. procera (Clausen) Kartesz, comb. nov. ined. | ledge stonecrop | Crassulaceae
|
| RHIN11 | Rhodiola integrifolia Raf. | ledge stonecrop | Crassulaceae
|
| RHRH4 | Rhodiola rhodantha (Gray) Jacobsen | redpod stonecrop | Crassulaceae
|
| RHRO5 | Rhodiola roanensis Britt. | Rhodiola rosea | Crassulaceae
|
| RHRO3 | Rhodiola rosea L. | roseroot stonecrop | Crassulaceae
|
| RHODI | Rhodiola L. | stonecrop | Crassulaceae
|
| RHON | Rhodobryum ontariense (Kindb.) Par. in Kindb. | Ontario rhodobryum moss | Bryaceae
|
| RHRO6 | Rhodobryum roseum (Hedw.) Limpr. | rose rhodobryum moss | Bryaceae
|
| RHODO5 | Rhodobryum (Schimp.) Hampe | rhodobryum moss | Bryaceae
|
| RHAL5 | Rhododendron alabamense Rehd. | Alabama azalea | Ericaceae
|
| RHALA | Rhododendron albiflorum Hook. var. albiflorum | Cascade azalea | Ericaceae
|
| RHALW | Rhododendron albiflorum Hook. var. warrenii (A. Nels.) M.A. Lane | Cascade azalea | Ericaceae
|
| RHAL2 | Rhododendron albiflorum Hook. | Cascade azalea | Ericaceae
|
| RHARR | Rhododendron arborescens (Pursh) Torr. var. richardsonii Rehd. | Rhododendron arborescens | Ericaceae
|
| RHAR3 | Rhododendron arborescens (Pursh) Torr. | smooth azalea | Ericaceae
|
| RHAS2 | Rhododendron ashleyi Coker | Rhododendron maximum | Ericaceae
|
| RHAT | Rhododendron atlanticum (Ashe) Rehd. | dwarf azalea | Ericaceae
|
| RHAU | Rhododendron austrinum (Small) Rehd. | orange azalea | Ericaceae
|
| RHBA4 | Rhododendron �bakeri (Lemmon & McKay) Hume (pro sp.) | | Ericaceae
|
| RHBA3 | Rhododendron bakeri auct. non (Lemmon & McKay) Hume | Rhododendron cumberlandense | Ericaceae
|
| RHCA4 | Rhododendron calendulaceum (Michx.) Torr. | flame azalea | Ericaceae
|
| RHCA19 | Rhododendron californicum Hook. | Rhododendron macrophyllum | Ericaceae
|
| RHCAC4 | Rhododendron camtschaticum Pallas ssp. camtschaticum | Kamchatka rhododendron | Ericaceae
|
| RHCAG | Rhododendron camtschaticum Pallas ssp. glandulosum (Standl.) Hult�n | Kamchatka rhododendron | Ericaceae
|
| RHCA5 | Rhododendron camtschaticum Pallas | Kamchatka rhododendron | Ericaceae
|
| RHCA6 | Rhododendron canadense (L.) Torr. | rhodora | Ericaceae
|
| RHCA18 | Rhododendron candidum (Small) Rehd. | Rhododendron canescens | Ericaceae
|
| RHCAC5 | Rhododendron canescens (Michx.) Sweet var. candidum (Small) Rehd. | Rhododendron canescens | Ericaceae
|
| RHCAS | Rhododendron canescens (Michx.) Sweet var. subglabrum Rehd. | Rhododendron canescens | Ericaceae
|
| RHCA7 | Rhododendron canescens (Michx.) Sweet | mountain azalea | Ericaceae
|
| RHCA14 | Rhododendron carolinianum Rehd. | Carolina azalea | Ericaceae
|
| RHCA8 | Rhododendron catawbiense Michx. | Catawba rosebay | Ericaceae
|
| RHCH5 | Rhododendron chapmanii Gray | Chapman's rhododendron | Ericaceae
|
| RHCO5 | Rhododendron coryi Shinners | Rhododendron viscosum | Ericaceae
|
| RHCU | Rhododendron cumberlandense E.L. Braun | Cumberland rhododendron | Ericaceae
|
| RHFL | Rhododendron flammeum (Michx.) Sarg. | piedmont azalea | Ericaceae
|
| RHGR3 | Rhododendron groenlandicum (Oeder) Kron & Judd | Ledum groenlandicum | Ericaceae
|
| RHJA2 | Rhododendron japonicum (Gray) Sur. | Japanese azalea | Ericaceae
|
| RHKO | Rhododendron konori Becc. | Konor rhododendron | Ericaceae
|
| RHLAL | Rhododendron lapponicum (L.) Wahlenb. var. lapponicum | Lapland rosebay | Ericaceae
|
| RHLAP | Rhododendron lapponicum (L.) Wahlenb. var. parvifolium (M.F. Adams) Herder | Lapland rosebay | Ericaceae
|
| RHLA2 | Rhododendron lapponicum (L.) Wahlenb. | Lapland rosebay | Ericaceae
|
| RHMA3 | Rhododendron macrophyllum D. Don ex G. Don | Pacific rhododendron | Ericaceae
|
| RHMA4 | Rhododendron maximum L. | great laurel | Ericaceae
|
| RHMIC | Rhododendron minus Michx. var. chapmanii (Gray) Duncan & Pullen | Rhododendron chapmanii | Ericaceae
|
| RHMI2 | Rhododendron minus Michx. | piedmont rhododendron | Ericaceae
|