Monoon là chi thực vật có hoa trong họ Annonaceae.

Các loài trong chi này được ghi nhận tại tiểu lục địa Ấn Độ, Đông Dương, Malesia, New Guinea và Australia, với sự du nhập vào Tây Phi (Cameroon) cũng như Trinidad và Tobago. Một loạt các loài được chuyển vào đây từ chi Polyalthia.

Các loài
Plants of the World Online hiện tại công nhận các loài sau:
 Monoon acuminatum (Thwaites) B.Xue & R.M.K.Saunders, 2012
 Monoon amischocarpum (I.M.Turner) B.Xue & R.M.K.Saunders, 2012
 Monoon anomalum (Becc.) B.Xue & R.M.K.Saunders, 2012
 Monoon asteriellum (Ridl.) B.Xue & R.M.K.Saunders, 2012
 Monoon australe (Benth.) B.Xue & R.M.K.Saunders, 2012
 Monoon barnesii (Merr.) B.Xue & R.M.K.Saunders, 2012
 Monoon bathrantherum I.M.Turner, 2013
 Monoon bemban  Miq., 1865
 Monoon borneense (H.Okada) B.Xue & R.M.K.Saunders, 2012
 Monoon brevipedunculatum (Boerl.) B.Xue & R.M.K.Saunders, 2012
 Monoon chloranthum (K.Schum. & Lauterb.) B.Xue & R.M.K.Saunders, 2012
 Monoon chloroxanthum Miq., 1865
 Monoon coffeoides (Thwaites ex Hook.f. & Thomson) B.Xue & R.M.K.Saunders, 2012
 Monoon congestum (Ridl.) B.Xue & R.M.K.Saunders, 2012
 Monoon congregatum (King) B.Xue & R.M.K.Saunders, 2012
 Monoon coriaceum (Ridl.) B.Xue & R.M.K.Saunders, 2012
 Monoon costigerum Miq., 1865
 Monoon cratiense  (Bân) B.Xue & R.M.K.Saunders, 2012
 Monoon cupulare  (King) B.Xue & R.M.K.Saunders, 2012
 Monoon daclacense  (Bân) B.Xue & R.M.K.Saunders, 2012 - Ni cô sanh.
 Monoon elongatum  (Merr.) B.Xue & R.M.K.Saunders, 2012
 Monoon erianthoides  (Airy Shaw) B.Xue & R.M.K.Saunders, 2012
 Monoon fragrans  (Dalzell) B.Xue & R.M.K.Saunders, 2012
 Monoon fuscum  (King) B.Xue & R.M.K.Saunders, 2012
 Monoon gigantifolium  (Merr.) B.Xue & R.M.K.Saunders, 2012
 Monoon glabrum  (Hook.f. & Thomson) B.Xue & R.M.K.Saunders, 2012
 Monoon grandiflorum  (Becc.) B.Xue & R.M.K.Saunders, 2012
 Monoon grandifolium  (Elmer) B.Xue & R.M.K.Saunders, 2012
 Monoon harmandii  (Pierre) B.Xue & R.M.K.Saunders, 2012 - Nhọc Harmand, quần đầu Harmand.
 Monoon hookerianum  (King) B.Xue & R.M.K.Saunders, 2012
 Monoon hypogaeum  (King) B.Xue & R.M.K.Saunders, 2012
 Monoon jucundum  (Pierre) B.Xue & R.M.K.Saunders, 2012 - Ma trinh, Mã trình, nhọc lá dài.
 Monoon kingii  (Baker f.) B.Xue & R.M.K.Saunders, 2012
 Monoon klemmei  (Elmer) B.Xue & R.M.K.Saunders, 2012
 Monoon lateriflorum  (Blume) Miq., 1865 - Loài điển hình
 Monoon laui  (Merr.) B.Xue & R.M.K.Saunders, 2012 - Quần đầu lau, nhọc lá to.
 Monoon liukiuense  (Hatus.) B.Xue & R.M.K.Saunders, 2012
 Monoon longifolium  (Sonn.) B.Xue & R.M.K.Saunders, 2012
 Monoon longipes  Miq., 1865
 Monoon macranthum  (King) B.Xue & R.M.K.Saunders, 2012
 Monoon magnoliiflorum  (Maingay ex Hook.f. & Thomson) B.Xue & R.M.K.Saunders
 Monoon malayanum  I.M.Turner & Utteridge, 2015
 Monoon membranifolium  (J.Sinclair) B.Xue & R.M.K.Saunders, 2012
 Monoon merguiense  (Chatterjee) B.Xue & R.M.K.Saunders, 2012
 Monoon merrillii  (Kaneh.) I.M.Turner & Utteridge, 2017
 Monoon michaelii  (C.T.White) B.Xue & R.M.K.Saunders, 2012
 Monoon mindanaense  (Elmer) B.Xue & R.M.K.Saunders, 2012
 Monoon namkadingense  Soulad. & Tagane, 2018
 Monoon nitidum  (A.DC.) I.M.Turner, 2015
 Monoon oblongifolium  (C.B.Rob.) B.Xue & R.M.K.Saunders, 2012
 Monoon obtusum  (Craib) B.Xue & R.M.K.Saunders, 2012 - Quần đầu tà, màu cau.
 Monoon oligocarpum Miq., 1865
 Monoon pachypetalum  I.M.Turner & Utteridge, 2017
 Monoon pachyphyllum  (King) B.Xue & R.M.K.Saunders, 2012
 Monoon paradoxum  (Becc.) B.Xue & R.M.K.Saunders, 2012
 Monoon patinatum  (Jessup) B.Xue & R.M.K.Saunders, 2012
 Monoon polycarpum  (Burck) B.Xue & R.M.K.Saunders, 2012
 Monoon praestigiosum  (J.Sinclair) B.Xue & R.M.K.Saunders, 2012
 Monoon ramiflorum  (Merr.) B.Xue & R.M.K.Saunders, 2012
 Monoon salomonicum  I.M.Turner & Utteridge, 2017
 Monoon sclerophyllum  (Hook.f. & Thomson) B.Xue & R.M.K.Saunders, 2012
 Monoon shendurunii  (Basha & Sasidh.) B.Xue & R.M.K.Saunders, 2012
 Monoon simiarum  (Buch.-Ham. ex Hook.f. & Thomson) B.Xue & R.M.K.Saunders, 2012 - Quần đầu khỉ, nhọc đen.
 Monoon sublanceolatum Miq., 1865
 Monoon sympetalum  (Merr.) B.Xue & R.M.K.Saunders, 2012
 Monoon thorelii  (Pierre) B.Xue & R.M.K.Saunders, 2012 - Lèo heo, ngẵng chày, quần đầu Thorel, ngấn chày.
 Monoon tirunelveliense  (M.B.Viswan. & Manik.) B.Xue & R.M.K.Saunders, 2012
 Monoon vietnamensis N.S.Lý, 2017
 Monoon viride  (Craib) B.Xue & R.M.K.Saunders, 2012
 Monoon xanthopetalum  (Merr.) B.Xue & R.M.K.Saunders, 2012
 Monoon zamboangaense  (Merr.) B.Xue & R.M.K.Saunders, 2012

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