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Costaceae family

Cheilocostus speciosus (J. Koenig) C. D. Specht, Taxon 55(1):159.  2006.
Bas.: Banksea speciosa J. Koenig (1783).
Syn.: Costus speciosus (J. Koenig) J. Smith (1791).

Naturalized quite rare robust herb of wet roadsides and ditches at lower and middle elevations.
Native to tropical Asia, China.
Also a cultivated ornamental.