Explore / Range and rarity / Single-county taxa
Range and rarity
Single-county taxa
Taxa documented in only a single county across the entire catalogue. Mostly local endemics, sub-rank curiosities, and rarely-collected outliers — the eccentric edge of the flora.
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Showing 2,751–2,800 of 3,373.
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Ranunculus inamoenus Greene var. subaffinis (A. Gray) L.D. Benson RAINSgraceful buttercup · Ranunculaceae -
Ranunculus plebeius R. Br. ex DC. RAPL2common Australian buttercup · Ranunculaceae -
Ranunculus sabinei R. Br. RASA4Sabine buttercup · Ranunculaceae -
Rauvolfia tetraphylla L. RATE8be still tree · Apocynaceae -
Rauvolfia vomitoria Afzelius RAVOpoison devil's-pepper · Apocynaceae -
Reichardia picroides (L.) Roth REPIcommon brighteyes · 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 -
Retama monosperma (L.) Boiss. REMO2bridal broom · Fabaceae -
Rhamnus utilis Decne. RHUT80Chinese buckthorn · Rhamnaceae -
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 -
Rhodobryum roseum (Hedw.) Limpr. RHRO6rose rhodobryum moss · Bryaceae -
Rhododendron carolinianum Rehder RHCA14Carolina azalea · Ericaceae - Rhododendron ×bakeri (Lemmon & McKay) Hume (pro sp.) [canescens × flammeum] RHBA4hybrid rhododendron · Ericaceae
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Rhus kearneyi F.A. Barkley RHKEKearney's sumac · Anacardiaceae -
Rhynchosia edulis Griseb. RHEDChihuahuan snoutbean · Fabaceae -
Rhynchospora fascicularis (Michx.) Vahl var. distans (Michx.) Chapm. RHFADfascicled beaksedge · Cyperaceae - Rhynchospora rufa (Nees) Boeckeler RHRU2red beaksedge · Cyperaceae
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Rhynchospora tenuis Link RHTE2quill beaksedge · Cyperaceae -
Ribes canthariforme Wiggins RICA2Moreno currant · Grossulariaceae -
Ribes thacherianum (Jeps.) Munz RITHSanta Cruz gooseberry · Grossulariaceae -
Ribes tularense (Coville) Fedde RITUTulare gooseberry · Grossulariaceae -
Rorippa globosa (Turcz. ex Fisch. & C.A. Mey.) Hayek ROGL2globe yellowcress · Brassicaceae -
Rorippa indica (L.) Hiern. var. indica ROINIvariableleaf yellowcress · Brassicaceae - Rorippa intermedia (Kuntze) R. Stuckey ROIN2intermediate yellowcress · Brassicaceae
- Rorippa ×prostrata (Bergeret) Schinz & Thell. (pro sp.) [sylvestris × amphibia] ROPR4prostrate yellowcress · Brassicaceae
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Rosa minutifolia Engelm. ROMI80Baja rose · Rosaceae -
Rosa moschata J. Herrm. ROMOmusk rose · Rosaceae - Rosa myriadenia Greene, nom. inq. ROMYglandular rose · Rosaceae
- Rosa sicula Tratt. ROSI5Mediterranean rose · Rosaceae
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Rosa stellata Wooton ssp. mirifica (Greene) W.H. Lewis var. erlansoniae W.H. Lewis ROSTE2desert rose · Rosaceae -
Rosa tomentosa Sm. ROTOwhitewoolly rose · Rosaceae -
Rosa woodsii Lindl. var. glabrata (Parish) Cole ROWOGWoods' rose · Rosaceae -
Rosa ×dumetorum Thuill. [canina × obtusifolia] RODU5corymb rose · Rosaceae -
Rousselia humilis (Sw.) Urb. ROHUshineseed · Urticaceae -
Rubus alaskensis L.H. Bailey RUAL6Alaska blackberry · Rosaceae - Rubus aliceae L.H. Bailey RUAL7roadside raspberry · Rosaceae
- Rubus andrewsianus Blanch. RUAN2Andrews' blackberry · Rosaceae
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Rubus bifrons × ursinus [unnamed hybrid] RUBI7hybrid blackberry · Rosaceae - Rubus dissimilis L.H. Bailey RUDI3bristly Oswego blackberry · Rosaceae
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Rubus ellipticus Sm. RUEL3yellow Himalayan raspberry · Rosaceae -
Rubus ellipticus Sm. var. obcordatus Focke RUELOyellow Himalayan raspberry · Rosaceae -
Rubus flavinanus Blanch. RUFL3Windham County blackberry · Rosaceae - Rubus fryei H.A. Davis & T. Davis RUFR5Cacapon River blackberry · Rosaceae
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Rubus glaucifolius Kellogg var. ganderi (L.H. Bailey) Munz RUGLGCuyamaca raspberry · Rosaceae -
Rubus glaucifolius Kellogg var. glaucifolius RUGLG2San Diego raspberry · Rosaceae - Rubus hirsutus Thunb. RUHI4hirsute raspberry · Rosaceae