• Monadea Westerlund, 1902 (uncertain)
• Monadella Barrande, 1847 † (unaccepted)
• Monadelpha L.J. Gillespie & W.M. Cardinal-McTeague, 2020
• Monadelphanthus H. Karsten, 1860 accepted as Capirona Spruce, 1859
• Monadendron Pascher, 1942 (uncertain)
• Monadenia J. Lindley, 1835 accepted as Disa P.J. Bergius, 1767 [Family: Orchidaceae]
• Monadenia Pilsbry in Tryon & Pilsbry, 1895 [Family: Helminthoglyptidae]
• Monadenia callipeplus S.S. Berry, 1940
• Monadenia chaceana S.S. Berry, 1940
• Monadenia churchi Hanna & A.G. Smith, 1933
• Monadenia circumcarinata (Stearns, 1879)
• Monadenia cristulata S.S. Berry, 1940
• Monadenia fidelis (J.E. Gray, 1834)
• Monadenia hillebrandi (Newcomb, 1864)
• Monadenia infumata (Gould, 1855)
• Monadenia marmarotis S.S. Berry, 1940
• Monadenia mormonum (Pfeiffer, 1857)
• Monadenia rotifer S.S. Berry, 1940
• Monadenia scottiana S.S. Berry, 1940
• Monadenia setosa Talmadge, 1952
• Monadenia troglodytes Hanna & A.G. Smith, 1933
• Monadenia tuolumneana S.S. Berry, 1955
• Monadenia yosemitensis (Lowe, 1916)
• Monadeniidae
• Monadenium Pax, 1894 accepted as Euphorbia Linnaeus, 1753
• Monadenium aculeolatum Pax accepted as Monadenium echinulatum Stapf
• Monadenium angolense Bally
• Monadenium arborescens Bally
• Monadenium asperrimum Pax accepted as Monadenium echinulatum Stapf
• Monadenium bianoense Malaisse & Lecron
• Monadenium bodenghieriae Malaisse & Lecron
• Monadenium cannellii L.C. Leach
• Monadenium capitatum Bally
• Monadenium catenatum S. Carter
• Monadenium chevalieri N.E. Br.
• Monadenium clarae Malaisse & Lecron
• Monadenium coccineum Pax
• Monadenium crenatum N.E. Br.
• Monadenium crispum N.E. Br.
• Monadenium cupricola Malaisse & Lecron
• Monadenium depauperatum (Bally) S. Carter accepted as Monadenium parviflorum N.E. Br.
• Monadenium descampsii Pax
• Monadenium dilunguense Malaisse & Lecron
• Monadenium discoideum Bally
• Monadenium echinulatum Stapf
• Monadenium elegans S. Carter
• Monadenium ellenbeckii N.E. Br.
• Monadenium erubescens (Rendle) N.E. Br.
• Monadenium fanshawei Bally accepted as Monadenium capitatum Bally
• Monadenium filiforme (Bally) S. Carter
• Monadenium friesii N.E. Br.
• Monadenium fwambense N.E. Br.
• Monadenium gillettii S. Carter
• Monadenium gladiatum (Bally) S. Carter
• Monadenium globosum Bally & S. Carter
• Monadenium goetzei Pax
• Monadenium gossweileri N.E. Br. accepted as Endadenium gossweileri (N.E. Br.) L.C. Leach
• Monadenium gracile Bally
• Monadenium guentheri Pax
• Monadenium hedigerianum Malaisse
• Monadenium herbaceum Pax
• Monadenium heteropodum (Pax) N.E. Br.
• Monadenium hirsutum Bally
• Monadenium intermedium Bally accepted as Monadenium crispum N.E. Br.
• Monadenium invenustum N.E. Br.
• Monadenium kaessneri N.E. Br.
• Monadenium kimberleyanum G. Will.
• Monadenium kundelunguense Malaisse
• Monadenium laeve Stapf
• Monadenium letestuanum Denis
• Monadenium letouzeyanum Malaisse accepted as Monadenium nervosum Bally
• Monadenium lindenii S. Carter
• Monadenium lugardiae N.E. Br.
• Monadenium lunulatum Chiov.
• Monadenium mafingense Hargr.
• Monadenium magnificum E.A. Bruce
• Monadenium majus (Pax) N.E. Br. accepted as Monadenium erubescens (Rendle) N.E. Br.
• Monadenium mamfwense Malaisse & Lecron
• Monadenium montanum Bally
• Monadenium nervosum Bally
• Monadenium nudicaule Bally
• Monadenium orobanchoides Bally
• Monadenium parviflorum N.E. Br.
• Monadenium pedunculatum S. Carter
• Monadenium petiolatum Bally
• Monadenium pseudoracemosum Bally
• Monadenium pudibundum Bally
• Monadenium reflexum Chiov. ex Chiarugi
• Monadenium renneyi S. Carter
• Monadenium rhizophorum Bally
• Monadenium ritchiei Bally
• Monadenium rubellum (Bally) S. Carter
• Monadenium rugosum S. Carter
• Monadenium schaijesii Malaisse
• Monadenium schubei (Pax) N.E. Br.
• Monadenium shebeliense M.G. Gilbert
• Monadenium simplex Pax
• Monadenium spectabile S. Carter
• Monadenium spinescens (Pax) Bally
• Monadenium spinulosum S. Carter