Achillea millefolium var. densiloba P.D.Sell (original description)
Anthemis cotula var. vectensis (F.N.Williams) P.D.Sell (original description)
Arctium lappa subsp. nemorosum (Lej.) P.D.Sell accepted as Arctium nemorosum Lej. (original description)
Arctium lappa subsp. pubens (Bab.) P.D.Sell accepted as Arctium minus (Hill) Bernh. (original description)
Aster subg. Crinitaria (Cass.) P.D.Sell (original description)
Aster subg. Galatella (Cass.) P.D.Sell (original description)
Aster subg. Tripolium (Nees) P.D.Sell (original description)
Aster tripolium var. flosculosus (Gray) P.D.Sell (original description)
Bellis perennis f. disciformis P.D.Sell (original description)
Brachyglottis jubar P.D.Sell (original description)
Carduus crispus var. glareicola P.D.Sell (original description)
Carduus nutans var. litoralis P.D.Sell (original description)
Carlina vulgaris var. maritima (Rouy) P.D.Sell (original description)
Centaurea debeauxii var. minima (C.E.Britton) P.D.Sell (original description)
Centaurea debeauxii var. nemoralis (Jord.) P.D.Sell accepted as Centaurea nemoralis Jord. (original description)
Centaurea debeauxii var. pumila P.D.Sell (original description)
Centaurea debeauxii var. thuillieri (Dostál) P.D.Sell accepted as Centaurea thuillieri (Dostál) J.Duvign. & Lambinon (original description)
Centaurea scabiosa var. nana P.D.Sell (original description)
Chamaemelum nobile f. duplicatum (Gray) P.D.Sell (original description)
Chamaemelum nobile f. nudum (Gray) P.D.Sell (original description)
Cirsium vulgare var. litorale P.D.Sell (original description)
Conyza canadensis var. incisa P.D.Sell (original description)
Conyza canadensis var. obovoidea P.D.Sell (original description)
Conyza canadensis var. robusta P.D.Sell (original description)
Conyza canadensis var. simplex P.D.Sell (original description)
Conyza floribunda var. linearifolia P.D.Sell (original description)
Crepis vesicaria var. rutilans (Lacaita) P.D.Sell (original description)
Filago subg. Logfia (Cass.) P.D.Sell (original description)
Gnaphalium subg. Laphangium (Hilliard & B.L.Burtt) P.D.Sell accepted as Laphangium (Hilliard & B.L.Burtt) Tzvelev (original description)
Helminthotheca echioides var. incisa P.D.Sell (original description)
Helminthotheca echioides var. mollis (Duby) P.D.Sell (original description)
Helminthotheca echioides var. pratensis (Chevall.) P.D.Sell (original description)
Hieracium adelphicum P.D.Sell accepted as Hieracium glaucinum subsp. fraternum (Sudre) Soó (original description)
Hieracium aequiserratum P.D.Sell (original description)
Hieracium aggregatifoliium P.D.Sell (original description)
Hieracium amaurostictum W.Scott & R.C.Palmer (original description)
Hieracium amnicola P.D.Sell (original description)
Hieracium ampliatiforme P.D.Sell (original description)
Hieracium amydrostictum P.D.Sell (original description)
Hieracium apheles P.D.Sell (original description)
Hieracium apiculatidens P.D.Sell (original description)
Hieracium argentatum (Pugsley) P.D.Sell (original description)
Hieracium argentiforme P.D.Sell (original description)
Hieracium aristidens P.D.Sell (original description)
Hieracium armadalense P.D.Sell (original description)
Hieracium arranense P.D.Sell (original description)
Hieracium arvonense P.D.Sell (original description)
Hieracium ascendentidens P.D.Sell (original description)
Hieracium atriglandulosum P.D.Sell (original description)
Hieracium bettyhillense P.D.Sell (original description)
Hieracium boreoanglicum P.D.Sell (original description)
Hieracium breacense P.D.Sell (original description)
Hieracium breconense P.D.Sell (original description)
Hieracium breconicola P.D.Sell (original description)
Hieracium britannicoides P.D.Sell (original description)
Hieracium charitodon P.D.Sell (original description)
Hieracium chloranthum Pugsley ex P.D.Sell (original description)
Hieracium cyclicum P.D.Sell (original description)
Hieracium dalense P.D.Sell (original description)
Hieracium deargicola P.D.Sell & D.J.Tennant (original description)
Hieracium dentulum (E.F.Linton) P.D.Sell (original description)
Hieracium dowardense P.D.Sell (original description)
Hieracium einichense P.D.Sell & D.J.Tennant (original description)
Hieracium elevatum P.D.Sell (original description)
Hieracium elongatifolium P.D.Sell (original description)
Hieracium filisquamum P.D.Sell (original description)
Hieracium fissuricola P.D.Sell (original description)
Hieracium flocculipubens P.D.Sell (original description)
Hieracium flocculosiforme P.D.Sell (original description)
Hieracium fucatifolium P.D.Sell (original description)
Hieracium grampianum P.D.Sell (original description)
Hieracium hesperium P.D.Sell (original description)
Hieracium hyparcticoides Pugsley ex P.D.Sell (original description)
Hieracium hypophalacrum P.D.Sell (original description)
Hieracium inaequilaterum P.D.Sell (original description)
Hieracium inspissatum P.D.Sell (original description)
Hieracium irregularidens P.D.Sell (original description)
Hieracium kingshousense P.D.Sell (original description)
Hieracium kintyricum P.D.Sell (original description)
Hieracium klingrahoolense W.Scott & R.C.Palmer (original description)
Hieracium lagganense P.D.Sell (original description)
Hieracium lakelandicum P.D.Sell (original description)
Hieracium mammidens P.D.Sell (original description)
Hieracium mariae P.D.Sell (original description)
Hieracium neomicracladium P.D.Sell (original description)
Hieracium neosparsum (Zahn) P.D.Sell accepted as Hieracium murorum subsp. stenocranum (Omang) Zahn (original description)
Hieracium nigrifactum P.D.Sell (original description)
Hieracium ochthophilum P.D.Sell (original description)
Hieracium oenophyllum P.D.Sell (original description)
Hieracium ovaliforme P.D.Sell (original description)
Hieracium oxybeles P.D.Sell (original description)
Hieracium peccense (W.R.Linton) P.D.Sell (original description)
Hieracium pentaploideum P.D.Sell & D.J.Tennant (original description)
Hieracium peroblongum P.D.Sell (original description)
Hieracium prominentidens P.D.Sell accepted as Hieracium sabaudum subsp. macrodon (Sudre) Greuter (original description)
Hieracium promontoriale P.D.Sell (original description)
Hieracium protentum P.D.Sell (original description)
Hieracium pusillifolium P.D.Sell (original description)
Hieracium raveniorum P.D.Sell (original description)
Hieracium reticulatiforme P.D.Sell (original description)