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| Kingdom | Plantae
-- Planta, plantes, plants, Vegetal |
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| Subkingdom | Tracheobionta
-- vascular plants |
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| Division | Lycopodiophyta
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| Class | Lycopodiopsida
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| Order | Isoetales
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| Family | Isoetaceae
-- quillworts |
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| Genus | Isoetes L. -- quillwort |
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Direct Children: |
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| Variety |
Isoetes bolanderi var. bolanderi Engelm.
-- Bolander's quillwort | |
| Variety |
Isoetes engelmannii var. engelmannii A. Braun
-- Engelmann's quillwort | |
| Variety |
Isoetes flaccida var. rigida Engelm.
-- southern quillwort | |
| Variety |
Isoetes nuttallii var. nuttallii A. Braun ex Engelm.
-- Nuttall's quillwort | |
| Variety |
Isoetes virginica var. virginica N.E. Pfeiffer
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| Species |
Isoetes acadiensis Kott
-- Acadian quillwort | |
| Species |
Isoetes X altonharvillii L.J. Musselman & R.D. Bray
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| Species |
Isoetes appalachiana D.F. Brunton & D.M. Britton
-- Appalachian quillwort | |
| Species |
Isoetes bolanderi Engelm.
-- Bolander quillwort, Bolander's quillwort | |
| Species |
Isoetes boomii N. Luebke
-- Boom's quillwort | |
| Species |
Isoetes x brittonii Brunton & W.C. Taylor
-- Britton's quillwort | |
| Species |
Isoetes X bruntonii D.A. Knepper & L.J. Musselman
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| Species |
Isoetes butleri Engelm.
-- limestone quillwort, quillwort | |
| Species |
Isoetes X dodgei A.A. Eat. (pro sp.)
-- Dodge's quillwort | |
| Species |
Isoetes X eatonii Dodge (pro sp.)
-- Eaton's quillwort | |
| Species |
Isoetes engelmannii A. Braun
-- Appalachian quillwort | |
| Species |
Isoetes X fairbrothersii J.D. Montgomery & W.C. Taylor
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| Species |
Isoetes flaccida Shuttlw. ex A. Braun
-- southern quillwort | |
| Species |
Isoetes X foveolata A.A. Eat. ex Dodge (pro sp.)
-- quillwort | |
| Species |
Isoetes georgiana N. Luebke
-- Georgia quillwort | |
| Species |
Isoetes X harveyi A.A. Eat. (pro sp.)
-- Harvey's quillwort | |
| Species |
Isoetes hawaiiensis W.C. Taylor & W.H. Wagner
-- Hawai'i quillwort | |
| Species |
Isoetes X heterospora A.A. Eat. (pro sp.)
-- quillwort | |
| Species |
Isoetes X hickeyi W.C. Taylor & N. Luebke
-- Hickey's quillwort | |
| Species |
Isoetes howellii Engelm.
-- Howell's quillwort | |
| Species |
Isoetes hyemalis D.F. Brunton
-- evergreenquillwort | |
| Species |
Isoetes X jeffreyi D.M.& F. Britton
-- Jeffrey's quillwort | |
| Species |
Isoetes lacustris L.
-- lake quillwort | |
| Species |
Isoetes lithophila N.E. Pfeiffer
-- rock quillwort | |
| Species |
Isoetes louisianensis Thieret
-- Louisiana quillwort | |
| Species |
Isoetes maritima Underwood
-- maritime quillwort | |
| Species |
Isoetes melanopoda Gay & Durieu ex Durieu
-- blackfoot quillwort | |
| Species |
Isoetes melanospora Engelm.
-- black-spored quillwort, blackspore quillwort | |
| Species |
Isoetes nuttallii A. Braun ex Engelm.
-- Nuttall's quillwort | |
| Species |
Isoetes occidentalis Henderson
-- quillwort, western quillwort | |
| Species |
Isoetes orcuttii A.A. Eat.
-- Orcutt's quillwort | |
| Species |
Isoetes piedmontana (N.E. Pfeiffer) C.F. Reed
-- Peidmont quillwort | |
| Species |
Isoetes prototypus D.M. Britt.
-- spike quillwort | |
| Species |
Isoetes riparia Engelm. ex A. Braun
-- shore quillwort | |
| Species |
Isoetes saccharata Engelm.
-- sugar quillwort | |
| Species |
Isoetes tegetiformans Rury
-- mat-forming quillwort, Merlin's grass | |
| Species |
Isoetes tenella Léman
-- spiny-spore quillwort | |
| Species |
Isoetes X truncata (A.A. Eat.) Clute (pro sp.)
-- quillwort | |
| Species |
Isoetes tuckermanii A. Braun
-- isočte de Tuckerman, Tuckerman's quillwort, tuckerman's quillwort | |
| Species |
Isoetes valida (Engelm.) Clute
-- strong quillwort | |
| Species |
Isoetes virginica N.E. Pfeiffer
-- Virginia quillwort | |
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