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Range and rarity
Rare (≤ 5 counties)
A broader rarity slice: taxa known from five counties or fewer nationwide. Includes single-county endemics plus the next-most-restricted species.
- Matching taxa
- 9,281
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Showing 7,551–7,600 of 9,281.
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Ranunculus inamoenus Greene var. subaffinis (A. Gray) L.D. Benson RAINSgraceful buttercup · Ranunculaceae -
Ranunculus kamchaticus DC. RAKAKamchatka buttercup · Ranunculaceae -
Ranunculus macauleyi A. Gray var. macauleyi RAMAMRocky Mountain buttercup · Ranunculaceae -
Ranunculus mauiensis A. Gray RAMA5Maui buttercup · Ranunculaceae - Ranunculus oreogenes Greene RAOROregon buttercup · Ranunculaceae
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Ranunculus plebeius R. Br. ex DC. RAPL2common Australian buttercup · Ranunculaceae -
Ranunculus sabinei R. Br. RASA4Sabine buttercup · Ranunculaceae -
Ranunculus triternatus A. Gray RATR6obscure buttercup · Ranunculaceae -
Ranunculus turneri Greene RATUTurner's buttercup · Ranunculaceae -
Ranunculus uncinatus D. Don ex G. Don var. earlei (Greene) L.D. Benson RAUNEEarle's buttercup · Ranunculaceae -
Ratibida peduncularis (Torr. & A. Gray) Barnhart var. peduncularis RAPEP2naked Mexicanhat · Asteraceae -
Rauvolfia sandwicensis A. DC. RASA3devil's-pepper · Apocynaceae -
Rauvolfia tetraphylla L. RATE8be still tree · Apocynaceae -
Rauvolfia vomitoria Afzelius RAVOpoison devil's-pepper · Apocynaceae -
Rayjacksonia aurea (A. Gray) R.L. Hartm. & M.A. Lane RAAU4Houston tansyaster · Asteraceae -
Reichardia picroides (L.) Roth REPIcommon brighteyes · Asteraceae -
Reichardia tingitana (L.) Roth RETIfalse sowthistle · Asteraceae -
Remya kauaiensis Hillebr. REKAKauai remya · Asteraceae -
Remya mauiensis Hillebr. REMA2Maui remya · Asteraceae -
Remya montgomeryi W.L. Wagner & D.R. Herbst REMOKalalau Valley remya · Asteraceae -
Renealmia alpinia (Rottb.) Maas REAL2jenjibre-de-jardin · Zingiberaceae -
Renealmia occidentalis (Sw.) Sweet REOCbijao · Zingiberaceae -
Reseda phyteuma L. REPHrampion mignonette · Resedaceae -
Retama monosperma (L.) Boiss. REMO2bridal broom · Fabaceae -
Reynoldsia sandwicensis A. Gray RESA'ohe makai · Araliaceae -
Reynosia septentrionalis Urb. RESEdarlingplum · Rhamnaceae -
Rhagadiolus stellatus (L.) Gaertn. RHST3endive daisy · Asteraceae -
Rhamnus crocea Nutt. ssp. pilosa (Trel.) C.B. Wolf RHCRP2hollyleaf buckthorn · Rhamnaceae -
Rhamnus pirifolia Greene RHPIisland redberry · Rhamnaceae -
Rhamnus utilis Decne. RHUT80Chinese buckthorn · Rhamnaceae -
Rhinanthus major L. RHMA7European yellow rattle · Scrophulariaceae -
Rhipsalis baccifera (Sol. ex J.S. Muell.) Stearn RHBA2mistletoe cactus · Cactaceae -
Rhizomnium punctatum (Hedw.) T. Kop. RHPU7rhizomnium moss · Mniaceae -
Rhodanthe chlorocephala (Turcz.) P. Wilson RHCH13rosy sunray · Asteraceae -
Rhodanthe chlorocephala (Turcz.) P. Wilson ssp. rosea (Hook.) P. Wilson RHCHRrosy sunray · Asteraceae -
Rhodiola integrifolia Raf. ssp. leedyi (Rosend. & J.W. Moore) Kartesz RHINLLeedy's stonecrop · Crassulaceae -
Rhodiola integrifolia Raf. ssp. neomexicana (Britton) Kartesz RHINNNew Mexican stonecrop · Crassulaceae -
Rhodobryum roseum (Hedw.) Limpr. RHRO6rose rhodobryum moss · Bryaceae -
Rhododendron albiflorum Hook. var. warrenii (A. Nelson) M.A. Lane RHALWCascade azalea · Ericaceae -
Rhododendron camtschaticum Pall. ssp. glandulosum (Standl.) Hultén RHCAGKamchatka rhododendron · Ericaceae -
Rhododendron carolinianum Rehder RHCA14Carolina azalea · Ericaceae -
Rhododendron lapponicum (L.) Wahlenb. var. lapponicum RHLALLapland rosebay · Ericaceae -
Rhododendron occidentale (Torr. & A. Gray) A. Gray var. paludosum Jeps. RHOCPwestern azalea · Ericaceae -
Rhododendron occidentale (Torr. & A. Gray) A. Gray var. sonomense (Greene) Rehder RHOCSSonoma azalea · Ericaceae - Rhododendron ×bakeri (Lemmon & McKay) Hume (pro sp.) [canescens × flammeum] RHBA4hybrid rhododendron · Ericaceae
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Rhododon angulatus (Tharp) B.L. Turner RHAN5angled sandmint · Lamiaceae -
Rhus kearneyi F.A. Barkley RHKEKearney's sumac · Anacardiaceae -
Rhus lancea L. f. RHLA11African sumac · Anacardiaceae -
Rhus sandwicensis A. Gray RHSA2neneleau · Anacardiaceae -
Rhus trilobata Nutt. var. racemulosa (Greene) F.A. Barkley RHTRRskunkbush sumac · Anacardiaceae