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 1,651–1,700 of 3,373.
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Hymenophyllum wrightii Bosch HYWR2Wright's filmy fern · Hymenophyllaceae -
Hymenoxys ambigens (S.F. Blake) Bierner var. floribunda (A. Gray) W.L. Wagner HYAMFApache Passe rubberweed · Asteraceae -
Hymenoxys ambigens (S.F. Blake) Bierner var. neomexicana W.L. Wagner HYAMNPinaleno Mountain rubberweed · Asteraceae -
Hymenoxys lapidicola S.L. Welsh & Neese, nom. inq. HYLA7stone rubberweed · Asteraceae -
Hymenoxys perpygmaea W.C. Holmes, Singhurst & Mink HYPE2pygmy prairiedawn · Asteraceae -
Hypericum gramineum G. Forst. HYGR2grassy St. Johnswort · Clusiaceae -
Hypericum humifusum L. HYHU2trailing St. Johnswort · Clusiaceae -
Hypericum parvulum Greene HYPA6Sierra Madre St. Johnswort · Clusiaceae - Hypericum ×moserianum Luquet ex André [calycinum × patulum] HYMO2St. Johnswort · Clusiaceae
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Hypnum imponens Hedw. HYIM3hypnum moss · Hypnaceae - Hypoxis mexicana Schult. & Schult. f. HYME2Mexican yellow star-grass · Liliaceae
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Hyptis suaveolens (L.) Poit. HYSU3pignut · Lamiaceae -
Iberis gibraltarica L. IBGIGibraltar candytuft · Brassicaceae -
Idesia polycarpa Maxim. IDPOidesia · Flacourtiaceae -
Ilex krugiana Loes. ILKRtawnyberry holly · Aquifoliaceae -
Ilex paraguariensis A. St.-Hil. ILPA3mate · Aquifoliaceae - Iliamna crandallii (Rydb.) Wiggins ILCRCrandall's wild hollyhock · Malvaceae
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Impatiens sodenii Engl. & Warb. ex Engl. IMSOOliver's touch-me-not · Balsaminaceae -
Indigofera kirilowii Maxim. ex Palib. INKIKirilow's indigo · Fabaceae - Indigofera oxycarpa Desv. INOXAsian indigo · Fabaceae
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Inula salicina L. INSAwillowleaf yellowhead · Asteraceae -
Ionactis caelestis Leary & G.L. Nesom IOCA2Spring Mountain aster · Asteraceae - Ionactis elegans (Soreng & Spellenb.) G.L. Nesom IOELSierra Blanca least-daisy · Asteraceae
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Ionopsidium acaule (Desf.) Rchb. IOAC2false diamondflower · Brassicaceae -
Ipomoea asarifolia (Desr.) Roem. & Schult. IPASginger-leaf morning-glory · Convolvulaceae -
Ipomoea microdactyla Griseb. IPMIcalcareous morning-glory · Convolvulaceae -
Ipomoea tenuissima Choisy IPTE2rockland morning-glory · Convolvulaceae - Ipomoea ×multifida (Raf.) Shinners [coccinea × quamoclit] IPMU2cardinal climber · Convolvulaceae
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Ipomopsis congesta (Hook.) V.E. Grant ssp. nevadensis (Tidestr.) Kartesz & Gandhi IPCONballhead ipomopsis · Polemoniaceae -
Ipomopsis effusa (A. Gray) Moran IPEFBaja California ipomopsis · Polemoniaceae -
Ipomopsis pinnata (Cav.) V.E. Grant IPPISan Luis Mountain ipomopsis · Polemoniaceae -
Ipomopsis polyantha (Rydb.) V.E. Grant IPPOPagosa ipomopsis · Polemoniaceae - Ipomopsis ramosa Al Schneid. & Bregar IPRAcoral ipomopsis · Polemoniaceae
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Ipomopsis sancti-spiritus Wilken & Fletcher IPSA2Holy Ghost ipomopsis · Polemoniaceae -
Ipomopsis tenuituba (Rydb.) V.E. Grant ssp. latiloba V.E. Grant & Wilken IPTEL2slendertube skyrocket · Polemoniaceae -
Ipomopsis wrightii (A. Gray) Gould ex Shinners IPWR2leafy skyrocket · Polemoniaceae -
Iresine palmeri (S. Watson) Standl. IRPAPalmer's bloodleaf · Amaranthaceae -
Iris hartwegii Baker ssp. columbiana Lenz IRHACrainbow iris · Iridaceae -
Iris munzii R.C. Foster IRMUMunz's iris · Iridaceae -
Isocarpha oppositifolia (L.) Cass. ISOPRio Grande pearlhead · Asteraceae - Isocoma humilis G.L. Nesom ISHUZion goldenbush · Asteraceae
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Isodendrion hosakae H. St. John ISHO2cindercone isodendrion · Violaceae -
Isoetes hyemalis D.F. Brunton ISHYevergreen quillwort · Isoetaceae -
Isoetes minima A.A. Eaton ISMI4midget quillwort · Isoetaceae - Isoetes ×herb-wagneri W.C. Taylor [bolanderi × echinospora] ISHE2quillwort · Isoetaceae
- Isoetes ×heterospora A.A. Eaton (pro sp.) [lacustris × tuckermannii] ISHEquillwort · Isoetaceae
- Isoetes ×hickeyi W.C. Taylor & N. Luebke [lacustris × tenella] ISHI2quillwort · Isoetaceae
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Isolepis prolifera (Rottb.) R.Br. ISPR2proliferating bulrush · Cyperaceae -
Iva annua L. nom. inq. var. macrocarpa (S.F. Blake) R.C. Jacks., nom. inq. IVANMannual marsh elder · Asteraceae -
Iva asperifolia Less. IVASPensacola marsh elder · Asteraceae