Warszewiczia coccinea (Vahl) Klotzsch, Ber. Bekanntm. Verh. Königl. Preuss. Akad. Wiss. Berlin 1853: 497 (1853) (syn: Aegiphila macrophylla Sieber ex Schauer ; Calycophyllum coccineum (Vahl) DC.; Mussaenda coccinea (Vahl) Poir. ; Macrocnemum coccineum Vahl ; Warszewiczia macrophylla Wedd. ; Warszewiczia maynensis Wedd.; Warszewiczia poeppigiana Klotzsch ; Warszewiczia pulcherrima Klotzsch ; Warszewiczia schomburgkiana Klotzsch ; Warszewiczia splendens Wedd.);
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SE. Caribbean, S. Nicaragua to S. Tropical America: Bolivia, Brazil North, Brazil West-Central, Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Nicaragua, Panamá, Peru, Suriname, Trinidad-Tobago, Venezuela, Windward Is. as per POWO;
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Tree for ID : 301210 : AK-2:
Taken at the Royal Botanic Gardens, Peradeniya, Kandy, Sri Lanka on the 17th of November.
Hymenodictyon species, i think
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References:
POWO
https://en.wikipedia.org/wiki/Warszewiczia_coccinea
https://tropical.theferns.info/viewtropical.php?id=Warszewiczia+coccinea
https://www.inaturalist.org/taxa/196548-Warszewiczia-coccinea
https://www.nparks.gov.sg/florafaunaweb/flora/6/9/6958