Explore / Range and rarity / Rare (≤ 5 counties)
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 301–350 of 9,281.
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Alysicarpus rugosus (Willd.) DC. ALRU4red moneywort · Fabaceae -
Alyssum corsicum Duby ALCO16Brassicaceae -
Alyssum desertorum Stapf var. himalayensis Dudley ALDEHdesert madwort · Brassicaceae -
Alyssum murale Waldst. & Kit. ALMUyellowtuft · Brassicaceae -
Alyssum obovatum (C.A. Mey.) Turcz. ALOB5American madwort · Brassicaceae -
Alyssum szovitsianum Fisch. & C.A. Mey. ALSZ2Szowits' madwort · Brassicaceae -
Alyxia stellata (J.R. Forst. & G. Forst.) Roem. & Schult. ALST11maile · Apocynaceae - Amaranthus bigelovii Uline & Bray AMBIBigelow's amaranth · Amaranthaceae
- Amaranthus brownii Christoph. & Caum AMBR5Brown's amaranth · Amaranthaceae
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Amaranthus crispus (Lesp. & Thev.) N. Terracc. AMCR2crispleaf amaranth · Amaranthaceae -
Amaranthus macrocarpus Benth. AMMA6dwarf amaranth · Amaranthaceae -
Amaranthus muricatus (Gillies ex Moq.) Gillies ex Hieron. AMMU3African amaranth · Amaranthaceae -
Amaranthus obcordatus (A. Gray) Standl. AMOBTrans-Pecos amaranth · Amaranthaceae - Amaranthus tamaulipensis Henrickson AMTATamaulipas amaranth · Amaranthaceae
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Amaranthus tricolor L. AMTR2Joseph's-coat · Amaranthaceae -
Amaranthus venulosus S. Watson AMVE2fringed amaranth · Amaranthaceae -
Amaranthus watsonii Standl. AMWAWatson's amaranth · Amaranthaceae - Amaranthus ×texensis Henrickson [scleropoides × crassipes] AMTE9pigweed · Amaranthaceae
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Amaranthus ×tucsonensis Henrickson [hybridus × ?] AMTU2pigweed · Amaranthaceae -
Amberboa moschata (L.) DC. AMMOsweetsultan · Asteraceae -
Amblystegium serpens (Hedw.) Schimp. var. juratzkanum (Schimp.) Rau & Herv. AMSEJJuratzk's amblystegium moss · Amblystegiaceae -
Ambrosia artemisiifolia L. var. artemisiifolia AMARA2annual ragweed · Asteraceae -
Ambrosia cheiranthifolia A. Gray AMCH2Rio Grande ragweed · Asteraceae -
Ambrosia chenopodiifolia (Benth.) Payne AMCH5San Diego bur ragweed · Asteraceae -
Ambrosia cordifolia (A. Gray) Payne AMCO4Tucson bur ragweed · Asteraceae -
Ambrosia deltoidea (Torr.) Payne AMDE4triangle bur ragweed · Asteraceae -
Ambrosia hispida Pursh AMHI3coastal ragweed · Asteraceae -
Ambrosia ilicifolia (A. Gray) Payne AMIL2hollyleaf bur ragweed · Asteraceae -
Ambrosia linearis (Rydb.) Payne AMLI3streaked bur ragweed · Asteraceae -
Ambrosia pumila (Nutt.) A. Gray AMPU4dwarf bur ragweed · Asteraceae - Ambrosia ×helenae Rouleau [artemisiifolia × trifida] AMHE3ragweed · 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 arborea (Michx. f.) Fernald var. austromontana (Ashe) H.E. Ahles AMARA5downy serviceberry · Rosaceae - Ammophila champlainensis Seymour AMCH6Champlain beachgrass · Poaceae
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Ammoselinum giganteum J.M. Coult. & Rose AMGIwestern sandparsley · Apiaceae -
Amoreuxia gonzalezii Sprague & Riley AMGOSanta Rita mountain yellowshow · Bixaceae -
Amoreuxia palmatifida Moc. & Sessé ex DC. AMPA3Mexican yellowshow · Bixaceae -
Amorpha californica Nutt. var. napensis Jeps. AMCANNapa false indigo · Fabaceae -
Amorpha georgiana Wilbur var. georgiana AMGEGGeorgia false indigo · Fabaceae -
Amorpha herbacea Walter var. crenulata (Rydb.) Isely AMHECclusterspike false indigo · Fabaceae -
Amorpha laevigata Nutt. AMLA2smooth false indigo · Fabaceae - Amorpha ×notha Palmer [canescens × fruticosa] AMNOfalse indigo · Fabaceae
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Ampelodesmos mauritanicus (Poir.) T. Dur. & Schinz AMMA5Mauritanian grass · Poaceae -
Ampelopsis aconitifolia Bunge AMAC4monkshoodvine · Vitaceae -
Amphibromus neesii Steud. AMNE4Australian wallaby grass · Poaceae -
Amphibromus scabrivalvis (Trin.) Swallen AMSC4swamp wallaby grass · Poaceae -
Amphidium mougeotii (Bruch & Schimp.) Schimp. AMMO70Mougeot's amphidium moss · Orthotrichaceae - Amphipappus fremontii Torr. & A. Gray ex A. Gray ssp. fremontii AMFRFFremont's chaffbush · Asteraceae
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Amphitecna latifolia (Mill.) A.H. Gentry AMLA4black calabash · Bignoniaceae