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PLANT FAMILY: Costaceae
BOTANICAL NAME: Costus zechii
FORMAL SCIENTIFIC NAME: Costus zechii K.Schum.
This African species is listed as an "insufficiently known name" in Paul Maas' monograph on African Costaceae, published on 16 December 2016. (Monograph of African Costaceae, H. Maas-van de Kamer, P.J.M. Maas, J.J. Wieringa, C.D. Specht, Blumea 61, 2016: 280 - 318, http://www.ingentaconnect.com/content/nhn/blumea/2016/00000061/00000003/art00010)
This is believed to be an obsolete synonym for Costus dubius.
The African Plant Database lists this species as syn. For C. dubius