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 3,101–3,150 of 3,373.
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Stevia salicifolia Cav. STSAwillowleaf candyleaf · Asteraceae -
Streptanthus albidus Greene ssp. albidus STALAMetcalf Canyon jewelflower · Brassicaceae -
Streptanthus batrachopus J.L. Morrison STBA4Mt. Tamalpais jewelflower · Brassicaceae -
Streptanthus callistus J.L. Morrison STCA3Mt. Hamilton jewelflower · Brassicaceae -
Streptanthus cordatus Nutt. var. duranii Jeps. STCOD2heartleaf twistflower · Brassicaceae -
Streptanthus cordatus Nutt. var. piutensis J.T. Howell STCOPheartleaf twistflower · Brassicaceae -
Streptanthus cutleri Cory STCU3Cutler's jewelflower · Brassicaceae -
Streptanthus fenestratus (Greene) J.T. Howell STFETehipite Valley jewelflower · Brassicaceae -
Streptanthus glandulosus Hook. ssp. secundus (Greene) Kruckeb. STGLSsecund jewelflower · Brassicaceae -
Streptanthus glandulosus Hook. ssp. secundus (Greene) Kruckeb. var. hoffmanii Kruckeb. STGLH2secund jewelflower · Brassicaceae -
Streptanthus glandulosus Hook. ssp. secundus (Greene) Kruckeb. var. sonomensis Kruckeb. STGLS4secund jewelflower · Brassicaceae -
Streptanthus hispidus A. Gray STHI2Mt. Diablo jewelflower · Brassicaceae -
Streptanthus insignis Jeps. ssp. lyonii Kruckeb. & Morrison STINLArburua Ranch jewelflower · Brassicaceae - Streptanthus lemmonii S. Watson STLE8Lemmon's jewelflower · Brassicaceae
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Streptanthus morrisonii F.W. Hoffm. ssp. hirtiflorus STMOHDorr's Cabin jewelflower · Brassicaceae -
Streptanthus morrisonii F.W. Hoffm. ssp. morrisonii STMOMMorrison's jewelflower · Brassicaceae -
Streptanthus oblanceolatus T.W. Nelson & J.P. Nelson STOB5Trinity River jewelflower · Brassicaceae -
Streptanthus tortuosus Kellogg var. flavescens Jeps. STTOFshieldplant · Brassicaceae -
Streptanthus tortuosus Kellogg var. optatus Jeps. STTOO3shieldplant · Brassicaceae -
Streptanthus vernalis R. O'Donnell & R. W.Dolan STVE7early jewelflower · Brassicaceae -
Stroganowia tiehmii Rollins STTI2Talapoosa Peak pearpod · Brassicaceae -
Strumpfia maritima Jacq. STMA4pride of Big Pine · Rubiaceae -
Stylosanthes humilis Kunth STHU4Townsville stylo · Fabaceae -
Styrax platanifolius Engelm. ssp. youngiae (Cory) P.W. Fritsch STPLYYoung's snowbell · Styracaceae -
Suaeda conferta (Small) I.M. Johnst. SUCObeach seepweed · Chenopodiaceae -
Succisa pratensis Moench SUPRdevilsbit · Dipsacaceae -
Swallenia alexandrae (Swallen) Söderst. & Decker SWALEureka dunegrass · Poaceae - Symphoricarpos guadalupensis Correll SYGUMcKittrick's snowberry · Caprifoliaceae
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Symphyotrichum bahamense (Britton) G.L. Nesom SYBA5Bahaman aster · Asteraceae -
Symphyotrichum eulae (Shinners) G.L. Nesom SYEUTexas aster · Asteraceae -
Symphyotrichum greatae (Parish) G.L. Nesom SYGR7Greata's aster · Asteraceae -
Symphyotrichum pygmaeum (Lindl.) Brouillet & S. Selliah SYPY2pygmy aster · Asteraceae -
Symphyotrichum rhiannon Weakley & Govus SYRHRhiannon aster · Asteraceae -
Symphyotrichum simmondsii (Small) G.L. Nesom SYSI3Simmonds' aster · Asteraceae - Symphyotrichum ×columbianum (Piper) G.L. Nesom [campestre × ericoides] SYCO2aster · Asteraceae
- Symphyotrichum ×finkii (Rydb.) G.L. Nesom (pro sp.) [cordifolium × shortii] SYFI4aster · Asteraceae
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Symphytum tuberosum L. SYTUtuberous comfrey · Boraginaceae -
Synthyris missurica (Raf.) Pennell ssp. hirsuta Pennell SYMIHwestern mountain kittentails · Scrophulariaceae -
Synthyris ranunculina Pennell SYRA2Charleston Mountain kittentails · Scrophulariaceae - Syringa josikaea Jacq. f. ex Rchb. SYJO4Hungarian lilac · Oleaceae
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Syringa ×persica L. [afghanica × laciniata] SYPEPersian lilac · Oleaceae - Syzygium stelechanthum (Diels) Glassman SYST3syzygium · Myrtaceae
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Tabernaemontana alba Mill. TAAL4white milkwood · Apocynaceae -
Tabernaemontana divaricata (L.) R. Br. ex Roem. & Schult. TADI5pinwheelflower · Apocynaceae -
Tanacetum corymbosum (L.) Sch. Bip. TACO5corymbflower tansy · Asteraceae -
Taraxacum californicum Munz & I.M. Johnst. TACA5California dandelion · Asteraceae -
Taraxacum palustre (Lyons) Symons TAPA9marsh dandelion · Asteraceae - Taxus ×media Rehder [baccata × cuspidata] TAME2hybrid yew · Taxaceae
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Tectaria coriandrifolia (Sw.) Underw. TECO3Hattie Bauer's halberd fern · Dryopteridaceae -
Tectaria fimbriata (Willd.) Proctor & Lourteig TEFI3least halberd fern · Dryopteridaceae