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
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Showing 4,701–4,750 of 9,281.
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Iris tenuissima Dykes ssp. purdyiformis (R.C. Foster) Lenz IRTEPlongtube iris · Iridaceae - Iris thompsonii R.C. Foster IRTHThompson's iris · Iridaceae
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Iris xiphium L. IRXISpanish iris · Iridaceae -
Isachne distichophylla Munro ex Hillebr. ISDIridgetop bloodgrass · Poaceae -
Isachne pallens Hillebr. ISPAKauai bloodgrass · Poaceae -
Ischaemum byrone (Trin.) Hitchc. ISBYHilo murainagrass · Poaceae -
Isocarpha oppositifolia (L.) Cass. ISOPRio Grande pearlhead · Asteraceae -
Isocoma arguta Greene ISAR2Carquinez goldenbush · Asteraceae -
Isocoma azteca G.L. Nesom ISAZAztec goldenbush · Asteraceae - Isocoma humilis G.L. Nesom ISHUZion goldenbush · Asteraceae
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Isocoma menziesii (Hook. & Arn.) G.L. Nesom var. decumbens (Greene) G.L. Nesom ISMEDMenzies' goldenbush · Asteraceae -
Isocoma menziesii (Hook. & Arn.) G.L. Nesom var. diabolica G.L. Nesom ISMED2Menzies' goldenbush · Asteraceae -
Isodendrion hosakae H. St. John ISHO2cindercone isodendrion · Violaceae -
Isodendrion laurifolium A. Gray ISLA3rockcliff isodendrion · Violaceae -
Isodendrion longifolium A. Gray ISLO2longleaf isodendrion · Violaceae -
Isodendrion pyrifolium A. Gray ISPYwahine noho kula · Violaceae -
Isoetes hyemalis D.F. Brunton ISHYevergreen quillwort · Isoetaceae -
Isoetes lithophila N.E. Pfeiffer ISLIrock quillwort · Isoetaceae -
Isoetes minima A.A. Eaton ISMI4midget quillwort · Isoetaceae - Isoetes saccharata Engelm. ISSAsugar quillwort · Isoetaceae
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Isoetes tegetiformans Rury ISTEMerlin's grass · Isoetaceae -
Isoetes tennesseensis Luebke & Budke ISTE6Tennessee Quillwort · Isoetaceae -
Isoetes texana Singhurst, Rushing & W.C. Holmes ISTE7Texas quillwort · Isoetaceae - Isoetes virginica N.E. Pfeiffer ISVIVirginia quillwort · Isoetaceae
- Isoetes ×carltaylorii Musselman [acadiensis × engelmannii] ISCA8Taylor's quillwort · Isoetaceae
- Isoetes ×foveolata A.A. Eaton ex R. Dodge (pro sp.) [engelmannii × tuckermannii] ISFOquillwort · 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
- Isoetes ×novae-angliae D.F. Brunt. & D.M. Britton [riparia × tuckermanii] ISNONew England quillwort · 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 annua L. var. caudata (Small) R.C. Jacks. IVANCannual marsh elder · Asteraceae -
Iva asperifolia Less. IVASPensacola marsh elder · Asteraceae -
Iva hayesiana A. Gray IVHASan Diego povertyweed · Asteraceae -
Ivesia aperta (J.T. Howell) Munz IVAPSierra Valley mousetail · Rosaceae -
Ivesia aperta (J.T. Howell) Munz var. aperta IVAPASierra Valley mousetail · Rosaceae -
Ivesia aperta (J.T. Howell) Munz var. canina Ertter IVAPCSierra Valley mousetail · Rosaceae -
Ivesia argyrocoma (Rydb.) Rydb. IVARsilverhair mousetail · Rosaceae -
Ivesia arizonica (Eastw. ex J.T. Howell) Ertter var. saxosa (Brandegee) Ertter IVARSrock whitefeather · Rosaceae -
Ivesia baileyi S. Watson var. baileyi IVBABBailey's ivesia · Rosaceae -
Ivesia callida (H.M. Hall) Rydb. IVCATahquitz mousetail · Rosaceae -
Ivesia campestris (M.E. Jones) Rydb. IVCA2field mousetail · Rosaceae -
Ivesia cryptocaulis (Clokey) D.D. Keck IVCRCharleston Peak mousetail · Rosaceae -
Ivesia jaegeri Munz & I.M. Johnst. IVJAJaeger's mousetail · Rosaceae -
Ivesia longibracteata Ertter IVLOlongbract mousetail · Rosaceae -
Ivesia lycopodioides A. Gray ssp. scandularis (Rydb.) D.D. Keck IVLYSclubmoss mousetail · Rosaceae -
Ivesia muirii A. Gray IVMUgranite mousetail · Rosaceae -
Ivesia multifoliolata (Torr.) D.D. Keck IVMU2manyleaf mousetail · Rosaceae -
Ivesia paniculata T.W. Nelson & J.P. Nelson IVPAAsh Creek mousetail · Rosaceae