PLANT FAMILY: Costaceae
BOTANICAL NAME: Dimerocostus
FORMAL SCIENTIFIC NAME: Dimerocostus O. Kuntze
The genus Dimerocostus is described as having large, unbranched plants with short ligules, green bracts, tubular bicarinate bracteoles and large showy flowers. They are distinguished from Costus by having bilocular ovules instead of trilocular.
The genus was described by Kuntze in 1891 and was included in Schumann 1904. A synonym is Mulfordia Rusby, Bull. Torrey Bot. Club 55:165 (1928). They are neotropical plants and are found from Honduras to Bolivia. There are only three currently described accepted species in the genus Dimerocostus: D. argenteus, D. cryptocalyx and the much more common D. strobilaceus, which is divided into three subspecies. It is proposed to be revised to five accepted species as follows:
In Chelsea Specht's 2006 phylogeny, the genus was found in a clade close to the genus Monocostus. A more recent phylogeny in 2020 at Cornell University included 12 samples covering all five proposed species and was well supported in separate clades.