PLANT FAMILY: Costaceae
BOTANICAL NAME: Costus adolphi-friderici
FORMAL SCIENTIFIC NAME: Costus adolphi-friderici Loes.
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 listed as a valid species on The Plant List: "The record derives from WCSP which reports it as an accepted name (record 234552?) with original publication details: Wiss. Erg. Deut. Zentr.-Afr. Exped., Bot. 2: 66 1910." It is listed on a website at http://floreafriquecentrale.org/cdm_dataportal/taxon/81e993ba-df01-4f55-9ebb-dcd9d2e81a03 in the Flora of Central Africa as a plant found in the DR Congo, Rwanda and Burundi Zaire in Africa.
The African Plant Database lists this species as a synonym of Costus dubius.