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African Costus are a pretty mixed-up group. The well-known Costus expert, Dr. Paul Maas, has been working on a monograph of the African plants, and there will likely be some substantial changes to the species groupings.
There are some very similar-looking plants that normally flower at the base with green bracts and mostly white flowers, very hard to tell apart. A key character is whether they produce one flower per bract or two flowers per bract. This can be difficult to see without breaking apart the inflorescence to see if there is one or two calyx under a single bract.
There are some thin-stemmed, vine-like Costus that flower laterally at the leaf nodes, as well as at the base with small but beautiful flowers in yellow, pink and white. These plants are well suited to growing in hanging baskets.
Finally there is Costus spectabilis, a deciduous plant that produces a bright yellow flower at the center of a rosette of large leaves that hug the surface of the ground.
Costus deistelii syn. of C. afer
Costus fissiligulatus syn. of C. phyllocephalus
Costus lucanusianus yellow flowering form
Costus maculatus syn. of C. dubius
Costus megalobractea syn. of C. afer
Costus sp. possibly letestui syn. of C. lateriflorus