Mesua thwaitesii

Mesua thwaitesii
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Malpighiales
Family:	Calophyllaceae
Genus:	Mesua
Species:	M. ferrea
Binomial name
Mesua ferrea Planch. & Triana

Mesua thwaitesii, is a species in the family Calophyllaceae. It is endemic to Sri Lanka, where Sinhalese people called "Diya Nā - දිය නා". The plant is highly valuable as a medicinal plant within the country.

Timber, seeds and bark of Mesua thwaitesii is known to have Xanthones and 4-phenylcoumarins.

These authors list Mesua ferrea as a separate species that is endemic to Sri Lanka and is a small, 15 meters high tree that grows near streams and in marshes in the Southwest of Sri Lanka, where it is called "Diya Na" in Sinhala, meaning "Water Na Tree". This "Diya Na" is not cultivated. Gunatilleke et al. (p. 139), however, remark in a footnote: "In the most recent revision diya na is named as Mesua thwaitesii and na as Mesua ferrea".

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