| Ulmus abelicea (Lam.) Sm. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus acuta Dumort. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus adiantifolia Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus alata Michx. | Accepted |  | TRO |  | 
	
		| Ulmus alba Raf. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus alba Kit. ex Willd. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × ambigua Beldie | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus americana L. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus americana var. alata (Michx.) Spach | Synonym |  | TRO |  | 
	
		| Ulmus americana f. alba (Aiton) Fernald | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus americana var. alba Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus americana f. americana | Synonym |  | TRO |  | 
	
		| Ulmus americana f. ascendens A.D. Slavin | Synonym |  | TRO |  | 
	
		| Ulmus americana var. aspera Chapm. | Synonym |  | TRO |  | 
	
		| Ulmus americana f. columnaris Rehder | Synonym |  | TRO |  | 
	
		| Ulmus americana var. floridana (Chapm.) Little | Synonym |  | TRO |  | 
	
		| Ulmus americana f. intercedens Fernald | Synonym |  | TRO |  | 
	
		| Ulmus americana f. laevior Fernald | Synonym |  | TRO |  | 
	
		| Ulmus americana var. pendula Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus americana f. pendula (Aiton) Fernald | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus americana var. rubra (Muhl.) Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus americana f. viridis F. Seym. | Synonym |  | TRO |  | 
	
		| Ulmus androssowii Litv. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus androssowii var. subhirsuta (C.K. Schneid.) P.H. Huang | Unresolved |  | TRO |  | 
	
		| Ulmus androssowii var. virgata (Wall. ex Planch.) Grudz. | Synonym |  | TRO |  | 
	
		| Ulmus anglica Druce | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus angustifolia (Weston) Weston | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus angustifolia var. cornubiensis (Weston) Melville | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus antarctica K.Koch | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus aquatica (J.F.Gmel.) Raf. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus araxina Takht. | Synonym |  | TRO |  | 
	
		| Ulmus asperrima Simonk. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus atinia Walker | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus aurea K.Koch | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus batavina K.Koch | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus berandii K.Koch | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus bergmanniana C.K. Schneid. | Accepted |  | TRO |  | 
	
		| Ulmus bergmanniana var. bergmanniana | Synonym |  | TRO |  | 
	
		| Ulmus bergmanniana var. lasiophylla C.K. Schneid. | Accepted |  | TRO |  | 
	
		| Ulmus betuloides Steud. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus boissieri Grudz. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus brandisiana C.K.Schneid. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus campestris L. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris Walter [Illegitimate] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris subsp. amplifolia Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. angustifolia Weston | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. chinensis Loudon | Synonym |  | TRO |  | 
	
		| Ulmus campestris f. concavifolia Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. cornubiensis Weston | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. dalmatica Bald. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. fungosa Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. glabra Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. japonica Rehder | Synonym |  | TRO |  | 
	
		| Ulmus campestris var. laevis Spach | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. laevis (Spach) Herder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. latifolia Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. major (Sm.) Walp. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. major (Sm.) Herder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. mollis Regel ex Herder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. monumentalis Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. parvifolia Regel ex Herder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. pendula Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. planifolia Loudon | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. propendens (C.K.Schneid.) Rehder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. pumila Herder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. pumila Maxim. | Synonym |  | TRO |  | 
	
		| Ulmus campestris f. purpurea Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. rotundifolia (Carrière) Mottet | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. sarniensis Loudon | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. sarniensis (Loudon) Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. stricta Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. suberosa (Moench) Wahlenb. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. suberosa (Moench) Herder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. suberosoalata Trautv. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. tortuosa Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. umbraculifera Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. umbraculifera Trautv. | Synonym |  | TRO |  | 
	
		| Ulmus campestris f. variegata Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. virens Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. vulgaris Aiton | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. vulgaris (Aiton) Herder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris subsp. vulgaris (Aiton) Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris f. wendworthii Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus campestris var. wheatleyi Simon-Louis | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus canescens Melville | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus carpinifolia Gled. [Unplaced] | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus carpinifolia Suckow [Illegitimate] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus carpinifolia var. cornubiensis (Weston) Rehder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus carpinifolia f. sarniensis (Loudon) Rehder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus carpinifolia var. umbraculifera (Trautv.) Rehder | Unresolved |  | TRO |  | 
	
		| Ulmus castaneifolia Hemsl. | Accepted |  | TRO |  | 
	
		| Ulmus cavaleriei H. Lév. | Synonym |  | TRO |  | 
	
		| Ulmus cebennensis Audib. ex Planch. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus celtidea Litv. | Synonym |  | TRO |  | 
	
		| Ulmus changii W.C. Cheng | Accepted |  | TRO |  | 
	
		| Ulmus changii var. changii | Synonym |  | TRO |  | 
	
		| Ulmus changii var. kunmingensis (W.C. Cheng) W.C. Cheng & L.K. Fu | Accepted |  | TRO |  | 
	
		| Ulmus chenmoui W.C. Cheng | Accepted |  | TRO |  | 
	
		| Ulmus chinensis Pers. | Synonym |  | TRO |  | 
	
		| Ulmus chumlia Melville & Heybroek | Synonym |  | TRO |  | 
	
		| Ulmus ciliata Ehrh. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus cinerea Planch. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus communis Carrière | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus communis var. ornata Carrière | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus cordifrons Johanss. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus coreana Nakai | Synonym |  | TRO |  | 
	
		| Ulmus coritana Melville | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus cornubiensis K.Koch | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus corylacea Dumort. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus corylifolia Host | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus corylifolia Boreau | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus crassifolia Nutt. | Accepted |  | TRO |  | 
	
		| Ulmus crispa Willd. | Synonym |  | TRO |  | 
	
		| Ulmus cucullata Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus dampieri Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus dauvessei A.Henry | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus davidiana Planch. | Accepted |  | TRO |  | 
	
		| Ulmus davidiana var. davidiana | Synonym |  | TRO |  | 
	
		| Ulmus davidiana var. japonica (Rehder) Nakai | Accepted |  | TRO |  | 
	
		| Ulmus davidiana var. levigata (C.K. Schneid.) Nakai | Synonym |  | TRO |  | 
	
		| Ulmus davidiana var. mandshurica Skvortsov | Synonym |  | TRO |  | 
	
		| Ulmus davidiana var. pubescens Skvortsov | Synonym |  | TRO |  | 
	
		| Ulmus davidiana f. suberosa Nakai | Synonym |  | TRO |  | 
	
		| Ulmus densa Litv. | Accepted |  | TRO |  | 
	
		| Ulmus dentata Raf. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus dimidiata Raf. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × dippeliana C.K.Schneid. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus divaricata C.H. Mull. | Accepted |  | TRO |  | 
	
		| Ulmus diversifolia Melville | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus effusa Willd. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus × elegantissima Horw. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus elliptica K.Koch | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus elongata L.K. Fu & C.S. Ding | Accepted |  | TRO |  | 
	
		| Ulmus erosa Roth | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus erosa Wall. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus erythrocarpa W.C. Cheng | Synonym |  | TRO |  | 
	
		| Ulmus excelsa Borkh. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus exoniensis Loudon | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus expansa Rota | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus fastigiata Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus ferruginea W.C. Cheng | Synonym |  | TRO |  | 
	
		| Ulmus floridana Chapm. | Synonym |  | TRO |  | 
	
		| Ulmus foliacea Gilib. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus foliacea var. stricta (Aiton) Rehder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus foliosa var. wheatleyi (Simon-Louis) Rehder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus fordii Loudon | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus forficata C.Presl | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus fulva Michx. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus fungosa (Aiton) Dum.Cours. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus gallica A.Chev. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus gaussenii W.C. Cheng | Accepted |  | TRO |  | 
	
		| Ulmus georgica Schchian | Synonym |  | TRO |  | 
	
		| Ulmus gigantea K.Koch | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus glabra Huds. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus glabra Mill. [Illegitimate] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus glabra f. concavifolia Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus glabra var. horizontalis (G.Kirchn.) Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus glabra f. propendens C.K.Schneid. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus glabra f. sarniensis (Loudon) C.K.Schneid. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus glandulosa Lindl. ex Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus glaucescens Franch. | Accepted |  | TRO |  | 
	
		| Ulmus glaucescens var. glaucescens | Synonym |  | TRO |  | 
	
		| Ulmus glutinosa Willd. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus grossheimii Takht. | Synonym |  | TRO |  | 
	
		| Ulmus harbinensis S.Q. Nie & K.Q. Huang | Accepted |  | TRO |  | 
	
		| Ulmus × hillieri Hillier | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus × hollandica Mill. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus hollandica Mill. | Unresolved |  | TRO |  | 
	
		| Ulmus × hollandica var. insularum Richens | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus × hollandica var. pendula (Loudon) Rehder | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus hookeriana Planch. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus horizontalis Loudon [Invalid] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus humilis J.G.Gmel. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus humilis Amman ex Steud. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus inflexa (Hayne) Sloboda | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus integrifolia Roxb. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus intermedia Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus ismaelis Todzia & Panero | Accepted |  | TRO |  | 
	
		| Ulmus japonica (Rehder) Sarg. | Synonym |  | TRO |  | 
	
		| Ulmus japonica var. levigata C.K. Schneid. | Synonym |  | TRO |  | 
	
		| Ulmus keaki Siebold | Synonym |  | TRO |  | 
	
		| Ulmus keia-ki Planch. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus kijimana Makino | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus kunmingensis W.C. Cheng | Synonym |  | TRO |  | 
	
		| Ulmus kunmingensis var. qingchengshanensis T.P. Yi | Synonym |  | TRO |  | 
	
		| Ulmus laciniata (Trautv.) Mayr | Accepted |  | TRO |  | 
	
		| Ulmus laevigata Royle | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus laevis Pall. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus lamellosa C. Wang & S.L. Chang | Accepted |  | TRO |  | 
	
		| Ulmus lanceifolia Roxb. ex Wall. | Accepted |  | TRO |  | 
	
		| Ulmus lancifolia Roxb. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus lasiophylla (C.K. Schneid.) W.C. Cheng | Synonym |  | TRO |  | 
	
		| Ulmus latifolia Moench | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus lesueurii Standl. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus leucocarpa Schur | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus leucosperma Schur | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus longifolia Raf. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus macrocarpa Hance | Accepted |  | TRO |  | 
	
		| Ulmus macrocarpa var. macrocarpa | Synonym |  | TRO |  | 
	
		| Ulmus macrocarpa f. major Skvortsov | Synonym |  | TRO |  | 
	
		| Ulmus macrocarpa var. mandshurica Skvortsov | Synonym |  | TRO |  | 
	
		| Ulmus macrocarpa f. minor Skvortsov | Synonym |  | TRO |  | 
	
		| Ulmus macrocarpa var. mongolica Liou & Li | Synonym |  | TRO |  | 
	
		| Ulmus macrocarpa var. nana Liou & Li | Synonym |  | TRO |  | 
	
		| Ulmus macrocarpa var. suberosa Skvortsov | Synonym |  | TRO |  | 
	
		| Ulmus macrophylla Nakai | Synonym |  | TRO |  | 
	
		| Ulmus major Sm. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus major var. heterophylla Maxim. & Rupr. | Synonym |  | TRO |  | 
	
		| Ulmus manshurica Nakai | Synonym |  | TRO |  | 
	
		| Ulmus × mesocarpa M.Kim & S.Lee | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus mexicana (Liebm.) Planch. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus mianzhuensis T.P. Yi & Lin Yang | Accepted |  | TRO |  | 
	
		| Ulmus microcarpa L.K. Fu | Accepted |  | TRO |  | 
	
		| Ulmus microphylla Pers. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus minor Mill. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus minor subsp. angustifolia (Weston) Stace | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor subsp. canescens (Melville) Browicz & Ziel. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor var. cornubiensis (Weston) Richens | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor var. lockii (Druce) Richens | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor subsp. procera (Salisb.) Franco | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor subsp. sarniensis (Loudon) Stace | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor var. sarniensis (Loudon) Richens | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor var. suberosa (Moench) Soó | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus minor var. suberosa (Moench) Dostál | Synonym |  | TRO |  | 
	
		| Ulmus minor var. vulgaris (Aiton) Richens | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus modiolina Dum.Cours. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × modiolina A.Chev. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus mollifolia Marshall | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus montana With. [Illegitimate] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus montana var. laciniata Trautv. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus montana f. laciniata (Trautv.) Herder | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus montana var. pendula Loudon | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus montana var. pendula-variegata Hartwig & Rümpler | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus montana var. rugosa Loudon | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus monterreyensis C.H. Mull. | Synonym |  | TRO |  | 
	
		| Ulmus monumentalis Rinz ex Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × mossii A.Henry | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus multinervis W.C. Cheng | Synonym |  | TRO |  | 
	
		| Ulmus multinervosa C.H. Mull. | Accepted |  | TRO |  | 
	
		| Ulmus nana Borkh. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus nemoralis Aiton | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus nemoralis Boiss. ex Planch. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus nemorosa Borkh. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus nervosa Hemsl. | Unresolved |  | TRO |  | 
	
		| Ulmus nigra Lodd. ex Loudon | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus nitens Moench | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus nitens var. stricta (Aiton) A.Henry | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus nitens var. wheatleyi (Simon-Louis) A.Henry | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus nuda Ehrh. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus oblongata (Hayne) Sloboda | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus obovata Raf. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus octandra Schkuhr | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus ontariensis Steud. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus opaca Nutt. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus parvifolia Jacq. | Accepted |  | TRO |  | 
	
		| Ulmus pedunculata Foug. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus pendula Willd. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus × pendula W.Mast. [Illegitimate] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus pinguis Raf. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus pinnato-ramosa Dieck ex Koehne | Synonym |  | TRO |  | 
	
		| Ulmus pitteursii C.Morren ex Dippel. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × planereoides Carrière | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus plotii Druce | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus podolica Klokov | Synonym |  | TRO |  | 
	
		| Ulmus polygama Juss. ex Poir. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus procera Salisb. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus propinqua Koidz. | Synonym |  | TRO |  | 
	
		| Ulmus prunifolia W.C. Cheng & L.K. Fu | Accepted |  | TRO |  | 
	
		| Ulmus pseudopropinqua Wang & Li | Accepted |  | TRO |  | 
	
		| Ulmus pseudosuberosa Blocki | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus pubescens Walter | Synonym |  | TRO |  | 
	
		| Ulmus pumila L. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus pumila Walter [Illegitimate] | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus pumila var. microphylla Pers. | Synonym |  | TRO |  | 
	
		| Ulmus pumila var. pilosa Rehder | Synonym |  | TRO |  | 
	
		| Ulmus pumila var. sabulosa J.H. Guo, Yu S. LI & J.H. Li | Synonym |  | TRO |  | 
	
		| Ulmus pumila var. suberosa (Moench) Turcz. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus purpurea Planch. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus pyramidalis Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus racemosa D.Thomas [Illegitimate] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus reticulata Dumort. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus rosseelsii Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus rotundata (Hayne) Sloboda | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus rotundifolia Carrière | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus rubra Muhl. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus sarniensis (Loudon) H.H.Bancr. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus × sarniensis (C.K.Schneid.) Melville | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus sativa Mill. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus sativa var. lockii Druce | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus scabra Mill. | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus scabra f. horizontalis (G.Kirchn.) Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus scabra f. pendula (Loudon) Dippel | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus scampstoniensis Steud. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus serotina Sarg. | Accepted |  | TRO |  | 
	
		| Ulmus × serpentina Shrubsole | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus shirasawana Daveau | Synonym |  | TRO |  | 
	
		| Ulmus sieboldii Daveau | Synonym |  | TRO |  | 
	
		| Ulmus sieboldii f. shirasawana (Daveau) Nakai | Synonym |  | TRO |  | 
	
		| Ulmus simplicidens E.L. Wolf | Synonym |  | TRO |  | 
	
		| Ulmus × smithii A.Henry | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus sparsa Dumort. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus stricta (Aiton) Lindl. [Illegitimate] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus stricta var. goodyeri Melville | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus stricta var. sarniensis (Loudon) Moss | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus stricta var. wheatleyi (Simon-Louis) Bean | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus suberosa Moench | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus suberosa var. folia-variegata-pendula de Vos | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus sukaczevii Andrews | Synonym |  | TRO |  | 
	
		| Ulmus superba A.Henry | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus surculosa Stokes | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus szechuanica W.P. Fang | Accepted |  | TRO |  | 
	
		| Ulmus taihangshanensis S.Y. Wang | Synonym |  | TRO |  | 
	
		| Ulmus tetrandra Schkuhr | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus thomasii Sarg. | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus tiliifolia Host | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus tomentosa Borkh. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus tonkinensis Gagnep. | Synonym |  | TRO |  | 
	
		| Ulmus tortuosa Host | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus transbaicalensis Steud. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus tridens Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus triserrata Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus turkestanica Req. | Synonym |  | TRO |  | 
	
		| Ulmus urticifolia Audib. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus uyematsui Hayata | Accepted |  | WCSP (in review) |  | 
	
		| Ulmus uzbekistanica Drobow | Synonym |  | TRO |  | 
	
		| Ulmus × vegeta Ley | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × verschaffeltii Dippel [Invalid] | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus villosa Brandis ex Gamble | Accepted |  | TRO |  | 
	
		| Ulmus virens Dippel | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus virgata Wall. ex Planch. | Synonym |  | TRO |  | 
	
		| Ulmus viscosa Desf. ex Steud. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus vulgaris Pall. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus wallichiana Planch. | Accepted |  | TRO |  | 
	
		| Ulmus wallichii Planch. | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × webbiana J.Lee ex K.Koch | Unresolved |  | WCSP (in review) |  | 
	
		| Ulmus × wentworthii-pendula de Vos | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus wheatleyi (Simon-Louis) Druce | Synonym |  | WCSP (in review) |  | 
	
		| Ulmus wilsoniana C.K. Schneid. | Synonym |  | TRO |  | 
	
		| Ulmus wilsoniana var. psilophylla C.K. Schneid. | Synonym |  | TRO |  | 
	
		| Ulmus wilsoniana var. subhirsuta C.K. Schneid. | Synonym |  | TRO |  | 
	
		| Ulmus wyssotzkyi Kotov | Synonym |  | TRO |  |