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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.
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Showing 1,051–1,100 of 9,281.
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Azolla pinnata R. Br. ssp. asiatica R.M.K. Saunders & K. Fowler AZPIAfeathered mosquitofern · Azollaceae -
Baccharis dioica Vahl BADI3broombush false willow · Asteraceae -
Baccharis havardii A. Gray BAHA2Havard's false willow · Asteraceae -
Baccharis malibuensis R.M. Beauch. & J. Henrickson BAMA13Malibu baccharis · Asteraceae -
Baccharis plummerae A. Gray BAPLPlummer's baccharis · Asteraceae - Baccharis plummerae A. Gray ssp. glabrata Hoover BAPLGsmooth baccharis · Asteraceae
- Baccharis plummerae A. Gray ssp. plummerae BAPLPPlummer's baccharis · Asteraceae
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Baccharis vanessae R.M. Beauch. BAVA3Encinitis false willow · Asteraceae - Bahia bigelovii A. Gray BABI2Bigelow's bahia · Asteraceae
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Baldellia ranunculoides (L.) Parl. BARAlesser waterplantain · Alismataceae -
Ballota nigra L. var. alba (L.) Sm. BANIAblack horehound · Lamiaceae - Ballota nigra L. var. foetida (Hayek) Vis. BANIF2black horehound · Lamiaceae
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Balsamorhiza lanata (Sharp) W.A. Weber BALA8lanate balsamroot · Asteraceae - Balsamorhiza ×bonseri H. St. John (pro sp.) [rosea × sagittata] BABObalsamroot · Asteraceae
- Balsamorhiza ×terebinthacea (Hook.) Nutt. (pro sp.) [deltoidea × hookeri] BATE3balsamroot · Asteraceae
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Baltimora recta L. BARE2beautyhead · Asteraceae -
Bambusa vulgaris Schrad. ex J.C. Wendl. BAVU2common bamboo · Poaceae -
Baptisia arachnifera Duncan BAARcobwebby wild indigo · Fabaceae -
Baptisia calycosa Canby var. calycosa BACAC2Florida wild indigo · Fabaceae -
Baptisia lanceolata (Walter) Elliott var. lanceolata BALALgopherweed · Fabaceae -
Baptisia simplicifolia Croom BASIscareweed · Fabaceae - Baptisia ×bicolor Greenm. & Larisey [australis × bracteata] BABI4wild indigo · Fabaceae
- Baptisia ×microphylla Nutt. (pro sp.) [perfoliata × tinctoria] BAMI3wild indigo · Fabaceae
- Baptisia ×serenae M.A. Curtis (pro sp.) [albescens × tinctoria] BASE3wild indigo · Fabaceae
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Barbula convoluta Hedw. BACO8convoluted barbula moss · Pottiaceae -
Barkleyanthus salicifolius (Kunth) H. Rob. & Brettell BASA5willow ragwort · Asteraceae -
Barleria lupulina Lindl. BALU2hophead Philippine violet · Acanthaceae -
Bartlettia scaposa A. Gray BASCBartlett daisy · Asteraceae -
Basiphyllaea corallicola (Small) Ames BACO2Carter's orchid · Orchidaceae -
Bastardia viscosa (L.) Kunth BAVI4viscid mallow · Malvaceae - Bastardia viscosa (L.) Kunth var. viscosa BAVIVviscid mallow · Malvaceae
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Batesimalva violacea (Rose) Fryxell BAVI5purple gaymallow · Malvaceae -
Bauhinia lunarioides A. Gray ex S. Watson BALUTexasplume · Fabaceae -
Bauhinia purpurea L. BAPUbutterfly tree · Fabaceae -
Bauhinia variegata L. BAVAmountain ebony · Fabaceae -
Bauhinia yunnanensis Franch. BAYUYunnan bauhinia · Fabaceae -
Begonia foliosa Kunth BEFOfuchsia begonia · Begoniaceae - Begonia foliosa Kunth var. miniata (Planch.) L.B. Sm. & B.G. Schub. BEFOMfuchsia begonia · Begoniaceae
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Begonia hirtella Link BEHI2Brazilian begonia · Begoniaceae -
Begonia reniformis Dryand. BERE2grapeleaf begonia · Begoniaceae -
Beloglottis costaricensis (Rchb. f.) Schltr. BECO5Costa Rican lady's tresses · Orchidaceae -
Benitoa occidentalis (H.M. Hall) D.D. Keck BEOCbenitoa · Asteraceae -
Berberis darwinii Hook. BEDADarwin's berberis · Berberidaceae -
Berberis harrisoniana Kearney & Peebles BEHA2Harrison's barberry · Berberidaceae -
Berberis julianae C.K. Schneid. BEJU4wintergreen barberry · Berberidaceae -
Berberis wilcoxii Kearney BEWIWilcox's barberry · Berberidaceae -
Bergerocactus emoryi (Engelm.) Britton & Rose BEEMgolden snakecactus · Cactaceae -
Berkheya heterophylla O. Hoffm. BEHEprickly gousblom · Asteraceae -
Berteroa mutabilis (Vent.) DC. BEMUroadside false madwort · Brassicaceae -
Besseya oblongifolia Pennell BEOB2eggleaf coraldrops · Scrophulariaceae