Anomalous names are names of plants for which I have determined a problem exists, i.e., the name could pertain to a taxon that was never validly published or it could pertain to a name of uncertain application, etc.
Synonyms are shown as indented entries beneath their accepted names and are preceded by a greater-than sign (>).
PTERIDOPHYTA
ASPLENIACEAE
Phyllitis scolopendrium (L.) Newman var. emarginata Fern. ex Boivin
(nomen nudum)
BLECHNACEAE
Blechnum orientale L.
(nomen nudum, possibly intended for B. occidentale L.)
CYATHEACEAE
Cyathea wilsonii (Hook.) Proctor
(Cnemidaria horrida × Cyathea arborea – an unnamed intergeneric hybrid, thus not referable to either genus)
>Hemitelia wilsonii Hook.
GLEICHENIACEAE
Dicranopteris sandwicensis O. Deg.
(application of name uncertain regarding North American plants)
LYCOPODIACEAE
Lycopodium cernuum L. var. crassifolium Spring
(application of name uncertain regarding North American plants)
PTERIDACEAE
Doryopteris tryonii O.& I. Deg.
(application of name uncertain regarding North American plants)
Pellaea ×wagneri Windham
(nomen nudum)
GYMNOSPERMAE
PINACEAE
Pinus ×rigitaeda auct.
(nomen invalidum)
ANGIOSPERMAE
ACANTHACEAE
Adhatoda dulcis Cav.
(nomen nudum)
Barleria nitida Jacq.
(nomen nudum)
Justicia longii R. Hilsenbeck
(nomen nudum)
Justicia parviflora (Buckl.) Lindau, non Retz.
(nomen nudum)
Justicia pilosella (Nées) R. Hilsenbeck
(nomen nudum)
Justicia turneri R. Hilsenbeck
(nomen nudum)
AGAVACEAE
Yucca glauca Nutt. var. mollis Engelm.
(nomen nudum)
AMARANTHACEAE
Alternanthera palmeri S. Wats.
(nomen nudum)
APIACEAE
Cymopterus packardiae Cronq.
(nomen nudum)
ASPLENIACEAE
Asplenium platyneuron (L.) B.S.P. var. proliferum D.C. Eat.
(nomen nudum)
ASTERACEAE
Achillea millefolium L. ssp. megacephala (Raup) auct.
(nomen nudum)
Argyroxiphium virescens Hbd. var. paludosa St. John
(an unnamed natural hybrid of A. grayanum × A. virescens)
Aster ×tardiflorus L.
(an interspecific hybrid of A. cordifolius × A. puniceus)
>Aster novi-belgii L. ssp. tardiflorus (L.) A.G. Jones
>Aster novi-belgii L. var. tardiflorus (L.) A.G. Jones
>Symphyotrichum novi-belgii (L.) Nesom var. tardiflorum (L.) Nesom
Dubautia ciliolata (DC.) Keck var. laxiflora (DC.) Keck
(an unnamed hybrid of D. ciliolata × D. scabra)
>Railliardia ciliolata DC. var. laxiflora (DC.) Sherff
Dubautia demissifolia (Sherff) Keck var. verticillata (Sherff) Keck
(an unnamed hybrid of D. menziesii × D. scabra)
>Railliardia demissifolia Sherff var. verticillata Sherff
Dubautia laxa Hook. & Arn. var. blakei O. Deg. & Sherff
(an unnamed hybrid of D. laxa × D. scabra)
Dubautia microcephala Skottsberg var. forbesii Sherff
(an unnamed hybrid of D. microcephala × D. plantaginea)
Dubautia waialealae Rock var. megaphylla Sherff
(an unnamed hybrid of D. imbricata × D. waialealae)
Erigeron purpuratus Greene ssp. pallens (Cronq.) G.W. Douglas
(nomen nudum, a nomenclatural synonym of Erigeron pallens Cronq.)
Haplopappus lanulosus (Greene) M.E. Peck
(nomen nudum)
Heliomeris ciliata (Robins. & Greenm.) Yates
(nomen invalidum)
Leptilon floribundum Kunth
(nomen nudum)
Malacothrix crispifolia
(nomen nudum)
Malacothrix intermedia
(nomen nudum)
Oonopsis puebloensis
(nomen nudum)
Pentachaeta exigua (Gray) Tomb
(typographic error, intended for Prenanthella exigua (Gray) Rydb.)
Prenanthes alba L. ssp. pallida Milstead
(nomen invalidum)
Senecio bartianus Heller
(typographic error, intended for S. hartianus Heller)
Silphium integrifolium Michx. var. asperrimum (Hook.) B.L. Turner
(nomen nudum)
BEGONIACEAE
Begonia ×tuberhybrida Voss
(nomen nudum)
>Begonia ×tuberosa hort.
BRASSICACEAE
Arabis bolanderi S. Wats.
(application of name uncertain regarding North American plants)
Draba incisa auct.
(nomen nudum)
Matthiola longipetala (Vent.) DC. var. sterilis (Airy-Shaw) Boivin
(nomen nudum)
Sisymbrium richardsonii Sweet
(nomen nudum)
CAPPARACEAE
Cleome tenuifolia Le Conte ex Torr. & Gray
(nomen nudum)
CARYOPHYLLACEAE
Silene involucrata (Cham. & Schlecht.) Bocquet var. apetala Farw.
(nomen nudum, published as a forma)
CELASTRACEAE
Mortonia sempervirens Gray ssp. scabrella (Gray) Prigge
(nomen nudum)
CONVOLVULACEAE
Ipomoea sectifolia Shinners
(nomen nudum)
Ipomoea vulgaris Choisy
(nomen invalidum, possibly intended for Quamoclit vulgaris Choisy)
Jacquemontia tridentata (L.) Hallier f.
(nomen nudum)
CUCURBITACEAE
Psiguria cookiana auct.
(nomen nudum)
CUSCUTACEAE
Cuscuta vivipara T. Beliz
(nomen nudum)
CYPERACEAE
Carex demareei Palmer
(nomen nudum)
Carex viridior Mackenzie
(a name applied to a mixture of C. atrata L. and C. atrosquama Mackenzie)
Cyperus ×weatherbianus Fern.
(an intergeneric hybrid between Dulichium arundinaceum × Rhynchospora capitellata, thus not referable to either genus)
Eleocharis baldwiniana (J.A. Schultes) Torr.
(nomen nudum, probably intended for Fimbristylis baldwiniana (J.A. Schultes) Torr.)
Scirpus microcarpus J.& K. Presl var. bissellii (Fern.) House
(apparently an unnamed hybrid between S. expansus and S. microcarpus)
>Scirpus sylvaticus L. var. bissellii Fern.
EUPHORBIACEAE
Euphorbia austrina auct.
(nomen nudum)
Mammillaria scolymoides Scheidw.
(nomen nudum, a nomenclatural synonym of Coryphantha scolymoides (Scheidw.) Berger)
FABACEAE
Astragalus molybdenus Barneby var. shultziorum (Barneby) R.W. Scott
(nomen invalidum)
Crotalaria palmensis (Christ) Hutchinson
(nomen nudum)
Dalea albiflora Gray ssp. villosa (Rydb.) Wiggins
(nomen nudum, possibly intended for Thornbera albiflora (Gray) Rydb. ssp. villosa (Rydb.) Wiggins)
Dalea pedunculata Pursh
(nomen nudum)
Lupinus lasalensis D.Dunn
(nomen nudum)
Psoralea glandulosa L. var. torreyana (L. Benson) I.M. Johnston
(application of name uncertain regarding North American plants)
HYDROCHARITACEAE
Halophila decipiens Ostenf. var. pubescens den Hartog
(No type cited)
HYDROPHYLLACEAE
Nama arizonicum Bacon
(nomen nudum)
Phacelia dasyphylla Greene ex Baker
(nomen nudum)
IRIDACEAE
Xiphion xiphium L.
(nomen nudum)
LAMIACEAE
Agastache neomexicana (Briq.) Standl. ssp. havardii (Gray) Lint
(nomen nudum)
LILIACEAE
Lilium jacintense (Munz) Mingrone & Ownbey
(nomen nudum)
Nothoscordum striatum Kunth
(application of name uncertain regarding North American plants)
Trillium cernuum L. var. tangerae Wherry
(nomen nudum)
Trillium recurvatum Beck var. lanceolatum S. Wats.
(nomen nudum)
LOASACEAE
Mentzelia multiflora (Nutt.) Nutt. ex Gray ssp. leucopetala Thompson & Zavortink
(nomen invalidum)
Mentzelia paradoxica Thompson & Zavortink
(nomen invalidum)
Mentzelia sanjuanensis Thompson & Zavortink
(nomen invalidum)
MELASTOMATACEAE
Acisanthera erecta St.-Hil.
(nomen nudum)
Clidemia polystachya (Naud.) Cogn.
(later homonym, taxonomic disposition uncertain)
MYRTACEAE
Metrosideros collina (J.R. & G. Forst.) Gray var. nuda Skottsberg
(nomen nudum)
ONAGRACEAE
Gaura ludoviciana Raven & Gregory
(nomen nudum)
ORCHIDACEAE
Calopogon pulchellus R. Br. ex Ait. f. var. simpsonii (Chapman) Ames
(nomen nudum, a taxonomic synonym of Calopogon tuberosus var. simpsonii (Chapman) Magrath)
Cypripedium daultonii Soukup
(nomen nudum, a taxonomic synonym of C. kentuckense C.F. Reed)
Cypripedium planipetalum (Fern.) Morris & Eames
(not validly published, a taxonomic synonym of Cypripedium parviflorum var. pubescens (Willd.) Knight)
Habenaria dilatata (Pursh) Hook. var. laxiflora (Rydb.) Correll
(nomen nudum)
POACEAE
×Agroelymus bergrothii Rouss.
(a putative intergeneric hybrid of Elytrigia repens × Leymus mollis, thus inappropriate as ×Agroelymus)
×Agroelymus bowdenii Boivin
(a putative intergeneric hybrid of Pascopyrum smithii × Leymus innovatus, thus inappropriate as ×Agroelymus)
×Agroelymus hultenii Melderis
(a putative intergeneric hybrid of Elymus alaskanus × Leymus mollis, thus inappropriate as ×Agroelymus)
×Agrohordeum jordalii Melderis
(a putative intergeneric hybrid of Elymus macrourus × Hordeum brachyanthemum, thus inappropriate as ×Agrohordeum)
×Agrohordeum langei (Krichter) Camus
(a putative intergeneric hybrid of Elytrigia repens × Hordeum marinum, thus inappropriate as ×Agrohordeum)
>×Hordeopyrum rouxii (Gren. & Duval) Simonet
Agropyron ×bowdenii Boivin
(a putative integeneric hybrid of Elymus trachycaulus × Pseudoroegneria spicata, thus inappropriate as an Agropyron)
Agropyron glaucum (Desf. ex DC.) Roemer & J.A. Schultes
(an unnamed hybrid of Elytrigia intermedia × E. pycnanthes)
×Elyhordeum berkeleyana (Bowden) Bowden
(a putative intergeneric hybrid of Hordeum jubatum × Leymus condensatus, thus inappropriate as ×Elyhordeum)
>×Elymordeum berkeleyana Bowden
×Elyhordeum triploideum (Bowden) Bowden
(a putative intergeneric hybrid of Hordeum vulgare × Leymus racemosus, thus inappropriate as ×Elyhordeum)
Muhlenbergia pilosa auct.
(nomen nudum)
Polytrias racemosa (Nees) Hack.
(nomen nudum, probably intended for Polytrias praemorsa (Nees) Hack.)
Sporobolus microspermum (Lag.) A.S. Hitchc.
(a name applied to a cluster of species within the genus)
Trisetum laxum Nash
(nomen nudum, intended for Tripsaxum laxum)
POLEMONIACEAE
Gilia nubigena W.A. Anderson
(nomen nudum)
POLYGONACEAE
Eriogonum hirsutum Nutt.
(nomen nudum)
Polygonum otophyllum Fedde
(application of name uncertain regarding North American plants)
PORTULACACEAE
Claytonia spathulata Dougl. ex Hook.
(nomen illeg)
>Montia spathulata (Dougl. ex Hook.) T.J. Howell
Lewisia cotyledon (S. Wats.) B.L. Robins. var. fimbriata Hohn
(nomen nudum)
PRIMULACEAE
Primula wilcoxiana auct.
(nomen nudum)
RANUNCULACEAE
Anemone multifida Poir. ssp. globosa (Nutt. ex Torr. & Gray) Nutt. ex Torr. & Gray
(nomen nudum)
ROSACEAE
Crataegus acutiserrata Kruschke
(nomen invalidum, taxonomic disposition uncertain)
Crataegus shinnersii Kruschke
(nomen invalidum, taxonomic disposition uncertain)
Crataegus wisconsinensis Kruschke
(nomen invalidum, taxonomic disposition uncertain)
Prunus injuncta Small
(typographic error, intended for P. injucunda Small)
Prunus umbellata Ell. var. injuncta (Small) Sarg.
(typographic error, intended for Prunus umbellata Ell. var. injucunda (Small) Sarg.)
Rubus ferrofluvius Fuller & Davis
(nomen invalidum, type not designated)
×Sorbaronia alpina (Willd.) Schneid.
(an intergeneric hybrid between Aronia arbutifolia × Sorbus aria, thus not referable to either genus)
>Pyrus ×alpina Willd.
>Sorbus ×alpina (Willd.) Heynh.
×Sorbaronia arsenii (Britt. ex Arsene) G.N. Jones
(an intergeneric hybrid between Aronia arbutifolia × Sorbus decora, thus not referable to either genus)
×Sorbaronia fallax (Schneid.) Schneid.
(an intergeneric hybrid between Aronia melanocarpa × Sorbus aucuparia, thus not referable to either genus)
>Pyrus ×fallax (Schneid.) Fern.
×Sorbaronia hybrida (Moench) Schneid.
(an intergeneric hybrid between Aronia arbutifolia × Sorbus aucuparia, thus not referable to either genus)
>Pyrus hybrida Moench
×Sorbaronia jackii Rehd.
(an intergeneric hybrid between Aronia prunifolia × Sorbus americana, thus not referable to either genus)
>Pyrus ×jackii (Rehd.) Fern.
×Sorbaronia sorbifolia (Poir.) Schneid.
(an intergeneric hybrid between Aronia melanocarpa × Sorbus americana, thus not referable to either genus)
>Pyrus mixta Fern.
>Sorbus sargentii Dippel
>Sorbus sorbifolia (Poir.) Hedl.
RUBIACEAE
Sherardia orientalis Boiss. & Hohen.
(nomen nudum, intended for Asperula orientalis Boiss. & Hohen.)
Spermacoce brachysepala (Urban) Alain
(nomen nudum)
SALICACEAE
Salix ×clarkei Bebb
(nomen invalidum)
Salix cordata Muhl. var. acutidens (Pursh) Anderss.
(nomen nudum)
Salix ×pilosiuscula (Schneid.) Boivin
(application of name uncertain regarding North American plants)
Salix pellita (Anderss.) Anderss. ex Schneid. var. psila Schneid.
(nomen nudum, epithet published as a forma)
Salix sitchensis Sanson ex Bong. var. coulteri (Anderss.) Jepson
(nomen nudum, epithet published as a forma)
Salix subvillosa Ell.
(nomen nudum)
SAPOTACEAE
Achras bidentata A. DC.
(nomen nudum)
SCROPHULARIACEAE
Agalinis erecta (Walt.) Pennell
(nomen invalidum)
>Gerardia erecta Walt.
Aureolaria villosa (L.) Pennell
(nomen nudum)
Castilleja nervosa A. Nels.
(application of name uncertain regarding North American plants)
Cordylanthus eremicus (Coville & Morton) Munz ssp. bernardinus auct.
(nomen nudum)
Dasistoma pectinata (Nutt.) Benth.
(nomen nudum)
Penstemon canescens (Britt.) Britt. ssp. brevisepalus Crosswhite
(nomen nudum)
VALERIANACEAE
Valeriana obovata (Nutt.) Roemer & J.A. Schultes
(description not applicable to Valeriana, type not extant)
VERBENACEAE
Stachytarpheta cayennensis (L.C. Rich.) Vahl var. albiflora Moldenke
(nomen nudum)
Verbena ×perplexa Moldenke
(a putative hybrid of Glandularia goodingii × Glandula bipinnatifida thus inappropriate as a Verbena)
XYRIDACEAE
Xyris obscura Kral
(nomen nudum)