Stemonoporus is a genus of plants in the family Dipterocarpaceae. The genus is endemic to Sri Lanka. It contains 26 species, all but one confined to the perhumid forests of the island.

Species 26 species are accepted:This list has been compiled from the Dipterocarpaceae Data Base − held and maintained at the Royal Botanic Garden Edinburgh. Stemonoporus acuminatus (Thwaites) Bedd. Stemonoporus affinis Thwaites Stemonoporus angustisepalus Kosterm. Stemonoporus bullatus Kosterm. Stemonoporus canaliculatus Thwaites Stemonoporus ceylanicus (Wight) Alston Stemonoporus cordifolius (Thwaites) Alston Stemonoporus elegans (Thwaites) Alston Stemonoporus gardneri Thwaites Stemonoporus gilimalensis Kosterm. Stemonoporus gracilis Kosterm. Stemonoporus kanneliyensis Kosterm. Stemonoporus laevifolius Kosterm. Stemonoporus lanceolatus Thwaites Stemonoporus lancifolius (Thwaites) P.S.Ashton Stemonoporus latisepalus Kosterm. Stemonoporus marginalis Kosterm. Stemonoporus moonii Thwaites Stemonoporus nitidus Thwaites Stemonoporus oblongifolius Thwaites Stemonoporus petiolaris Thwaites Stemonoporus reticulatus Thwaites Stemonoporus revolutus Trimen ex Hook.f. Stemonoporus rigidus Thwaites Stemonoporus scalarinervis Kosterm. Stemonoporus scaphifolius Kosterm.

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