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Poaceae family

Cymbopogon citratus
(de Candolle) Stapf
, Bull. Misc. Inf. Kew 1906: 322, 357.  1906.
Bas.: Andropogon citratus de Candolle (1813).

Sitonnèl. Lemon grass.   
Naturalized quite rare herb of dry rocky hills.
Native to the Old World.

Also a cultivated culinary herb. Local medicinal uses.
See also Pectis elongata which has the same local name
A fire risk (the grass is rich in oil) on Pigeon Island and Dennery quarry where it forms monotypic stands Therefore invasive in small areas, with the potential to spread to the dry degraded slopes between Vieux Fort and Micoud.
Each year this grass poses a serious fire threat to the Jazz Festival.