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  Plantae
    Tracheophyta
           [Tracheobionta]
    Spermatophyta
      Magnoliophyta
             [Angiospermae]
         Monocots
                [Liliatae]
                [Liliopsida]
                [Monocotyledoneae]
                    Alismatales
                            <b>Hydrocharitaceae</b>
                                   [Anacharis oryzoides]
                                     <i>Anacharis</i>
                                     <i>Apalanthe</i>
                                             <i>Apalanthe schweinitzii</i>
                                     <i>Barkania</i>
                                     <i>Blyxa</i>
                                           [Enhydrias]
                                             <i>Blyxa aubertii</i>
                                                   [Blyxa malayana]
                                               <i>Blyxa aubertii var. aubertii</i>
                                             <i>Blyxa echinosperma</i>
                                                   [Blyxa aubertii var. echinosperma]
                                                   [Blyxa somae]
                                             <i>Blyxa hexandra</i>
                                             <i>Blyxa japonica</i>
                                               <i>Blyxa japonica var. alternifolia</i>
                                                     [Enhydrias angustipetala]
                                               <i>Blyxa japonica var. japonica</i>
                                                     [Blyxa laevissima]
                                             <i>Blyxa octandra</i>
                                             <i>Blyxa radicans</i>
                                             <i>Blyxa senegalensis</i>
                                     <i>Boottia</i>
                                     <i>Caulinia</i>
                                             <i>Caulinia graminea</i>
                                             <i>Caulinia minor</i>
                                             <i>Caulinia nigricans</i>
                                                   [Kennedya nigricans]
                                             <i>Caulinia spinulosa</i>
                                     <i>Egeria</i>
                                             <i>Egeria densa</i>
                                                   [Anacharis densa]
                                                   [Philotria densa]
                                             <i>Egeria najas</i>
                                     <i>Elodea</i>
                                             <i>Elodea bifoliata</i>
                                                   [Elodea longivaginata]
                                                   [Elodea nevadensis]
                                             <i>Elodea brandegeae</i>
                                             <i>Elodea callitrichoides</i>
                                                   [Anacharis callitrichoides]
                                             <i>Elodea canadensis</i>
                                                   [Anacharis canadensis var. planchonii]
                                                   [Anacharis canadensis]
                                                   [Elodea brandegeeae]
                                                   [Elodea ioensis]
                                                   [Elodea latifolia]
                                                   [Elodea linearis]
                                                   [Elodea planchonii]
                                                   [Philotria canadensis]
                                                   [Philotria linearis]
                                             <i>Elodea densa</i>
                                             <i>Elodea ernstiae</i>
                                             <i>Elodea fraseri</i>
                                             <i>Elodea granatensis</i>
                                             <i>Elodea nuttallii</i>
                                                   [Anacharis nuttallii]
                                                   [Anacharis occidentalis]
                                                   [Elodea columbiana]
                                                   [Elodea minor]
                                                   [Elodea nuttalli]
                                                   [Elodea occidentalis]
                                                   [Philotria angustifolia]
                                                   [Philotria minor]
                                                   [Philotria nuttallii]
                                                   [Philotria occidentalis]
                                                   [Udora verticillata var. minor]
                                             <i>Elodea potamogeton</i>
                                                   [Elodea titicacana]
                                             <i>Elodea schweinitzii</i>
                                             <i>Elodes petiolata</i>
                                     <i>Enhalus</i>
                                             <i>Enhalus acoroides</i>
                                                   [Enhalus koenigii]
                                                   [Stratiotes acoroides]
                                                   [Vallisneria marinus]
                                                   [Vallisneria sphaerocarpa]
                                     <i>Halophila</i>
                                             <i>Halophila aschersonii</i>
                                             <i>Halophila baillonis</i>
                                             <i>Halophila beccarii</i>
                                             <i>Halophila decipiens</i>
                                                   [Halophila decipiens var. pubescens]
                                             <i>Halophila engelmannii</i>
                                             <i>Halophila gaudichaudii</i>
                                                   [Thalassia cilata]
                                                   [Thalassia vaginata]
                                             <i>Halophila hawaiiana</i>
                                             <i>Halophila johnsonii</i>
                                             <i>Halophila minor</i>
                                                   [Lemnopsis minor]
                                             <i>Halophila ovalis</i>
                                               <i>Halophila ovalis subsp. hawaiiana</i>
                                               <i>Halophila ovalis subsp. linearis</i>
                                                     [Halophila linearis]
                                               <i>Halophila ovalis subsp. ovalis</i>
                                                     [Barkania punctata]
                                             <i>Halophila ovata</i>
                                             <i>Halophila stipulacea</i>
                                                   [Barkania bullata]
                                                   [Barkania stipulacea]
                                                   [Halophila balfourii]
                                                   [Zostera stipulacea]
                                     <i>Hydrilla</i>
                                             <i>Hydrilla verticillata</i>
                                                   [Elodea verticillata]
                                                   [Hydrilla angustifolia]
                                                   [Hydrilla dentata]
                                                   [Hydrilla lithuanica]
                                                   [Hydrilla najadifolia]
                                                   [Hydrilla ovalifolia]
                                                   [Hydrilla polysperma]
                                                   [Hydrilla roxburghii]
                                                   [Hydrilla subulata]
                                                   [Hydrilla verticillata var. brevifolia]
                                                   [Hydrilla verticillata var. roxburghii]
                                                   [Hydrilla wightii]
                                                   [Serpicula verticiliata]
                                                   [Vallisneria verticillata]
                                     <i>Hydrocharis</i>
                                             <i>Hydrocharis chevalieri</i>
                                                   [Hydrocharis salifera]
                                                   [Ottelia chevalieri]
                                             <i>Hydrocharis cordifolia</i>
                                             <i>Hydrocharis dubia</i>
                                                   [Hydrocharis asiatica]
                                             <i>Hydrocharis morsus-ranae</i>
                                             <i>Hydrocharis spongia</i>
                                     <i>Hydromystria</i>
                                             <i>Hydromystria laevigata</i>
                                             <i>Hydromystria stolonifera</i>
                                     <i>Lagarosiphon</i>
                                             <i>Lagarosiphon cordofanus</i>
                                                   [Lagarosiphon crispus]
                                                   [Lagarosiphon fischeri]
                                                   [Lagarosiphon nyassae]
                                                   [Lagarosiphon tenuis]
                                                   [Lagarosiphon tsotsorogensis]
                                                   [Udora cordofana]
                                             <i>Lagarosiphon hydrilloides</i>
                                             <i>Lagarosiphon ilicifolius</i>
                                             <i>Lagarosiphon major</i>
                                             <i>Lagarosiphon muscoides</i>
                                                   [Hydrilla muscoides]
                                                   [Lagarosiphon schweinfurthii]
                                             <i>Lagarosiphon rubellus</i>
                                             <i>Lagarosiphon steudneri</i>
                                             <i>Lagarosiphon verticillifolius</i>
                                     <i>Lemnopsis</i>
                                     <i>Limnobium</i>
                                             <i>Limnobium laevigatum</i>
                                             <i>Limnobium spongia</i>
                                               <i>Limnobium spongia spongia</i>
                                               <i>Limnobium spongia subsp. laevigatum</i>
                                               <i>Limnobium spongia subsp. spongia</i>
                                             <i>Limnobium stoloniferum</i>
                                     <i>Najas</i>
                                             <i>Najas affinis</i>
                                             <i>Najas ancistrocarpa</i>
                                             <i>Najas arguta</i>
                                               <i>Najas arguta var. arguta</i>
                                               <i>Najas arguta var. conferta</i>
                                             <i>Najas australis</i>
                                             <i>Najas baldwinii</i>
                                                   [Najas graminea var. minor]
                                                   [Najas liberiensis]
                                             <i>Najas conferta</i>
                                             <i>Najas filifolia</i>
                                             <i>Najas flexilis</i>
                                                   [Caulinia flexilis]
                                                   [Najas caespitosa]
                                                   [Najas caespitosus]
                                                   [Najas canadensis]
                                                   [Najas flexilis subsp. caespitosa]
                                                   [Najas flexilis subsp. caespitosus]
                                                   [Najas flexilis var. congesta]
                                                   [Najas flexilis var. robusta]
                                             <i>Najas gracillima</i>
                                             <i>Najas graminea</i>
                                                   [Najas graminea var. vulgata]
                                               <i>Najas graminea var. graminea</i>
                                                     [Caulinia alagnensis]
                                                     [Caulinia intermedia]
                                                     [Caulinia microphylla]
                                                     [Najas alagnensis]
                                                     [Najas graminea var. londidentata]
                                             <i>Najas guadalupensis</i>
                                                   [Najas flexilis var. fusiformis]
                                               <i>Najas guadalupensis guadalupensis</i>
                                               <i>Najas guadalupensis subsp. floridana</i>
                                               <i>Najas guadalupensis subsp. guadalupensis</i>
                                                     [Caulinia guadalupensis]
                                                     [Najas guadalupensis var. curassavica]
                                               <i>Najas guadalupensis subsp. muenscheri</i>
                                               <i>Najas guadalupensis subsp. olivacea</i>
                                               <i>Najas guadalupensis var. floridana</i>
                                               <i>Najas guadalupensis var. guadalupensis</i>
                                               <i>Najas guadalupensis var. muenscheri</i>
                                               <i>Najas guadalupensis var. olivacea</i>
                                             <i>Najas hagerupii</i>
                                             <i>Najas horrida</i>
                                                   [Najas interrupta]
                                                   [Najas marina var. angustifolia]
                                             <i>Najas indica</i>
                                               <i>Najas indica var. gracillima</i>
                                             <i>Najas malesiana</i>
                                             <i>Najas marina</i>
                                                   [Najas gracilis]
                                                   [Najas major var. angustifolia]
                                                   [Najas major var. gracilis]
                                                   [Najas major]
                                                   [Najas marina var. mexicana]
                                                   [Najas marina var. recurvata]
                                               <i>Najas marina subsp. armata</i>
                                                     [Caulinia muricata]
                                                     [Najas armata]
                                                     [Najas delilei]
                                                     [Najas marina subsp. delilei]
                                                     [Najas marina var. delilei]
                                                     [Najas marina var. ehrenbergii]
                                                     [Najas marina var. muricata]
                                                     [Najas muricata]
                                               <i>Najas marina subsp. arsenariensis</i>
                                               <i>Najas marina subsp. ehrenbergii</i>
                                               <i>Najas marina subsp. marina</i>
                                                     [Najas marina var. angustissima]
                                                     [Najas marina var. latifolia]
                                               <i>Najas marina subsp. microcarpa</i>
                                                     [Najas major var. microcarpa]
                                             <i>Najas microdon</i>
                                             <i>Najas minor</i>
                                                   [Najas fragilis]
                                             <i>Najas muenscheri</i>
                                             <i>Najas oguraensis</i>
                                             <i>Najas olivacea</i>
                                             <i>Najas pectinata</i>
                                             <i>Najas schweinfurthii</i>
                                             <i>Najas setacea</i>
                                                   [Najas minor var. setacea]
                                             <i>Najas tenuifolia</i>
                                             <i>Najas tenuissima</i>
                                             <i>Najas testui</i>
                                                   [Najas meiklei]
                                             <i>Najas welwitschii</i>
                                             <i>Najas wrightiana</i>
                                                   [Najas multidentata]
                                               <i>Najas wrightiana subsp. multidentata</i>
                                     <i>Nechamandra</i>
                                             <i>Nechamandra alternifolia</i>
                                                   [Lagarosiphon alternifolia]
                                                   [Lagarosiphon alternifolius]
                                                   [Lagarosiphon roxburghii]
                                                   [Nechamandra roxburghii]
                                                   [Vallisneria alternifolia]
                                     <i>Ottelia</i>
                                             <i>Ottelia acuminata</i>
                                             <i>Ottelia alismoides</i>
                                                   [Boottia bodinieri]
                                                   [Boottia thorelii]
                                                   [Damasonium indicum]
                                                   [Damasonium javanicum]
                                                   [Damasonium lactucifolium]
                                                   [Damasonium lancifolium]
                                                   [Damasonium timorense]
                                                   [Damasonium tranquebariense]
                                                   [Ottelia condorensis]
                                                   [Ottelia dioecia]
                                                   [Ottelia ensiformis]
                                                   [Ottelia hoffmeisteri]
                                                   [Ottelia japonica]
                                                   [Ottelia philippinensis]
                                             <i>Ottelia bongoensis</i>
                                             <i>Ottelia brachyphylla</i>
                                                   [Boottia brachyphylla]
                                             <i>Ottelia brasiliensis</i>
                                             <i>Ottelia brevifolia</i>
                                             <i>Ottelia cylindrica</i>
                                                   [Boottia cylindrica]
                                                   [Boottia stratiotes]
                                                   [Ottelia cylindrica var. stratiotes]
                                                   [Ottelia stratiotes]
                                             <i>Ottelia exserta</i>
                                                   [Boottia parviflora]
                                                   [Ottelia somalensis]
                                             <i>Ottelia fischeri</i>
                                                   [Boottia fischeri]
                                             <i>Ottelia kunenensis</i>
                                                   [Boottia kunenensis]
                                             <i>Ottelia lisowskii</i>
                                             <i>Ottelia luapulana</i>
                                             <i>Ottelia muricata</i>
                                                   [Boottia aschersoniana]
                                                   [Boottia mossambicensis]
                                                   [Boottia muricata]
                                             <i>Ottelia obtusifolia</i>
                                             <i>Ottelia ovalifolia</i>
                                             <i>Ottelia scabra</i>
                                                   [Boottia scabra]
                                             <i>Ottelia ulvifolia</i>
                                                   [Boottia abyssinica]
                                                   [Boottia crassifolia]
                                                   [Boottia macrantha]
                                                   [Boottia rohrbachiana]
                                                   [Ottelia abyssinica]
                                                   [Ottelia australis]
                                                   [Ottelia baumii]
                                                   [Ottelia benguellensis]
                                                   [Ottelia buchneri]
                                                   [Ottelia crassifolia]
                                                   [Ottelia halogena]
                                                   [Ottelia lancifolia]
                                                   [Ottelia latifolia]
                                                   [Ottelia massaiensis]
                                                   [Ottelia plantaginea]
                                                   [Ottelia rohrbachiana]
                                                   [Ottelia schweinfurthii]
                                                   [Ottelia vernayi]
                                                   [Ottelia vesiculata]
                                             <i>Ottelia verdickii</i>
                                                   [Ottelia gigas]
                                                   [Ottelia verdickii var. elanga]
                                     <i>Philotria</i>
                                     <i>Schizotheca</i>
                                     <i>Stratiotes</i>
                                             <i>Stratiotes alismoides</i>
                                             <i>Stratiotes aloides</i>
                                             <i>Stratiotes nymphoides</i>
                                     <i>Thalassia</i>
                                             <i>Thalassia hemprichii</i>
                                                   [Schizotheca hemprichii]
                                             <i>Thalassia testudinum</i>
                                     <i>Udora</i>
                                             <i>Udora verticillata</i>
                                     <i>Valisneria</i>
                                     <i>Vallisneria</i>
                                           [Maidenia]
                                             <i>Vallisneria americana</i>
                                                   [Vallisneria asiatica]
                                                   [Vallisneria neotropicalis]
                                                   [Vallisneria spiralis var. americana]
                                                   [Vallisneria spiralis var. asiatica]
                                                   [Vallisneria spiralis]
                                               <i>Vallisneria americana americana</i>
                                               <i>Vallisneria americana var. americana</i>
                                               <i>Vallisneria americana var. biwaensis</i>
                                             <i>Vallisneria australis</i>
                                             <i>Vallisneria gigantea</i>
                                             <i>Vallisneria natans</i>
                                             <i>Vallisneria rubra</i>
                                                   [Maidenia rubra]

Problematic Rooting (6418)
                                                   <i>Vallisneria spiralis f. aethiopica</i>
                                                         [Vallisneria denseserrulata]
                                                         [Vallisneria numidica]
                                                         [Vallisneria spiralis var. denseserrulata]