| Costus afer K. Gawl. |
Accepted |
18 |
| Costus bicolor J. Braun & K. Schum. |
Accepted |
9 |
| Costus curvibracteatus Maas |
Accepted |
9 |
| Costus deistelii K. Schum. |
Accepted |
18 |
| Costus dirzoi García-Mend. & G. Ibarra |
Accepted |
14 |
| Costus erythrocoryne K. Schum. |
Accepted |
9 |
| Costus glaucus Maas |
Accepted |
9 |
| Costus guanaiensis Rusby |
Accepted |
9 |
| Costus lucanusianus J. Braun & K. Schum. |
Accepted |
9 |
| Costus malortieanus H. Wendl. |
Accepted |
9 |
| Costus pictus D. Don |
Accepted |
18 |
| Costus pulverulentus C. Presl |
Accepted |
9 |
| Costus scaber Ruiz & Pav. |
Accepted |
9 |
| Costus schlechteri H. J. P. Winkl. |
Accepted |
None |
| Costus tonkinensis Gagnep. |
Accepted |
9 |
| Costus igneus N. E. Br. |
Synonym of Chamaecostus cuspidatus (Nees & Mart.) C. D. Specht & D. W. Stev. |
9 |
| Costus lacerus Gagnep. |
Synonym of Cheilocostus lacerus (Gagnep.) C. D. Specht |
9 |
| Costus speciosus (J. Koenig) Sm. |
Synonym of Cheilocostus speciosus (J. Koenig) C. D. Specht |
18 |
| Costus brasiliensis K. Schum. |
Synonym of Costus arabicus L. |
9 |
| Costus discolor Roscoe |
Synonym of Costus arabicus L. |
9 |
| Costus niveopurpureus Jacq. |
Synonym of Costus arabicus L. |
9 |
| Costus niveus G. Mey. |
Synonym of Costus arabicus L. |
9 |
| Costus macrostrobilus K. Schum. |
Synonym of Costus guanaiensis var. macrostrobilus (K. Schum.) Maas |
9 |
| Costus lucanusianus None |
Synonym of Costus lucanusianus J. Braun & K. Schum. |
9 |
| Costus mosaicus |
Synonym of Costus mosaicus W. Bull |
51 |
| Costus cylindricus Jacq. |
Synonym of Costus spicatus (Jacq.) Sw. |
8 |
| Costus friedrichsenii Petersen |
Synonym of Costus villosissimus Jacq. |
9 |
| Costus englerianus K. Schum. |
Synonym of Paracostus englerianus (K. Schum.) C. D. Specht |
18 |