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 51–100 of 2,083.
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Ageratum littorale A. Gray AGLI3Cape Sable whiteweed · Asteraceae -
Aglaonema commutatum Schott AGCO4Philippine evergreen · Araceae -
Aglaonema commutatum Schott var. maculatum (Hook. f.) Nicolson AGCOMPhilippine evergreen · Araceae - Agoseris grandiflora (Nutt.) Greene AGGRbigflower agoseris · Asteraceae
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Agrostis oregonensis Vasey AGOROregon bentgrass · Poaceae -
Agrostis variabilis Rydb. AGVAmountain bentgrass · Poaceae - Akebia ×pentaphylla (Makino) Makino [quinata × trifoliata] AKPE2chocolate vine · Lardizabalaceae
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Albizia lebbekoides (DC.) Benth. ALLE2Indian albizia · Fabaceae -
Albizia procera (Roxb.) Benth. ALPRtall albizia · Fabaceae -
Aldrovanda vesiculosa L. ALVE3waterwheel plant · Droseraceae -
Aliciella pinnatifida (Nutt. ex A. Gray) J.M. Porter ALPI2sticky gilia · Polemoniaceae -
Aliciella triodon (Eastw.) Brand ALTR14coyote gilia · Polemoniaceae -
Allionia incarnata L. var. villosa (Standl.) B.L. Turner ALINV2trailing windmills · Nyctaginaceae -
Allium atrorubens S. Watson var. atrorubens ALATAdarkred onion · Liliaceae -
Allium brandegeei S. Watson ALBRBrandegee's onion · Liliaceae -
Allium canadense L. var. hyacinthoides (Bush) Ownbey & Aase ALCAHhyacinth meadow garlic · Liliaceae -
Allium fistulosum L. ALFI4welsh onion · Liliaceae -
Allium nevadense S. Watson ALNENevada onion · Liliaceae -
Allium simillimum L.F. Hend. ALSIsimil onion · Liliaceae -
Allium sphaerocephalon L. ALSP4roundheaded leek · Liliaceae -
Allium victorialis L. ALVI3victory onion · Liliaceae - Alnus ×fallacina Callier [incana × serrulata] ALFA4alder · Betulaceae
- Alopecurus creticus Trin. ALCR7Cretan meadow foxtail · Poaceae
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Alopecurus rendlei Eig ALRE3Rendle's meadow foxtail · Poaceae -
Alstonia macrophylla Wall. ex G. Don ALMA16deviltree · Apocynaceae -
Althaea cannabina L. ALCA25palm-leaf marshmallow · Malvaceae - Alvaradoa amorphoides Liebm. ALAM3Mexican alvaradoa · Simaroubaceae
- Alvaradoa amorphoides Liebm. ssp. psilophyllis (Urb.) Cronquist ALAMP2Mexican alvaradoa · Simaroubaceae
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Alysicarpus rugosus (Willd.) DC. ALRU4red moneywort · Fabaceae -
Amaranthus macrocarpus Benth. AMMA6dwarf amaranth · Amaranthaceae -
Amaranthus muricatus (Gillies ex Moq.) Gillies ex Hieron. AMMU3African amaranth · Amaranthaceae -
Amaranthus venulosus S. Watson AMVE2fringed amaranth · Amaranthaceae -
Amaranthus ×tucsonensis Henrickson [hybridus × ?] AMTU2pigweed · Amaranthaceae -
Amberboa moschata (L.) DC. AMMOsweetsultan · Asteraceae -
Ambrosia artemisiifolia L. var. artemisiifolia AMARA2annual ragweed · Asteraceae -
Ambrosia ilicifolia (A. Gray) Payne AMIL2hollyleaf bur ragweed · Asteraceae - Ambrosia ×intergradiens W.H. Wagner [artemisiifolia × psilostachya] AMINragweed · Asteraceae
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Amelanchier arborea (Michx. f.) Fernald var. alabamensis (Britton) G.N. Jones AMARA3Alabama serviceberry · Rosaceae -
Amelanchier utahensis Koehne var. covillei (Standl.) N.H. Holmgren AMUTC2Coville's serviceberry · Rosaceae -
Amorpha herbacea Walter var. crenulata (Rydb.) Isely AMHECclusterspike false indigo · Fabaceae -
Ampelopsis aconitifolia Bunge AMAC4monkshoodvine · Vitaceae -
Amphibromus scabrivalvis (Trin.) Swallen AMSC4swamp wallaby grass · Poaceae -
Amphidium mougeotii (Bruch & Schimp.) Schimp. AMMO70Mougeot's amphidium moss · Orthotrichaceae -
Amsinckia douglasiana A. DC. AMDODouglas' fiddleneck · Boraginaceae -
Amsonia kearneyana Woodson AMKEKearney's bluestar · Apocynaceae -
Anacamptodon splachnoides (Froel. ex Brid.) Brid. ANSP11anacamptodon moss · Fabroniaceae -
Anacyclus clavatus (Desf.) Pers. ANCL2whitebuttons · Asteraceae -
Anagallis monelli L. ANMO2flaxleaf pimpernel · Primulaceae -
Andreaea rothii F. Weber & D. Mohr ANRO7Roth's andreaea moss · Andreaeaceae -
Andreaea rupestris Hedw. ANRU7andreaea moss · Andreaeaceae