| Costaceae | |
Costus speciosus var. angustifolius
| Ker Gawl. | Bot. Reg. 8: | 1822 |
| Costaceae | |
Costus speciosus var. argyrophyllus
| Wall. ex Baker | Fl. Brit. India 6: 249 | 1892 |
| Costaceae | |
Costus speciosus var. dilnavaziae
| M.R. Almeida & S.M. Almeida | J. Bombay Nat. Hist. Soc. 96: 356 | 1999 |
| Costaceae | |
Costus speciosus var. formosanus
| (Nakai) S.S. Ying | Quart. J. Chin. Forest. 21: 117 | 1988 |
| Costaceae | |
Costus speciosus var. glaber
| K. Schum. | Bot. Jahrb. Syst. 27: 343 | 1899 |
| Costaceae | |
Costus speciosus var. hirsutus
| Blume | Enum. Pl. Javae 1: 61 | 1827 |
| Costaceae | |
Costus speciosus var. hirsutus
| (C. Presl) K. Schum. | Bot. Jahrb. Syst. 27: 343 | 1899 |
| Costaceae | |
Costus speciosus var. leocalyx
| Nakai | J. Jap. Bot. 17(4): 197–198 | 1941 |
| Costaceae | * |
Costus speciosus var. nipalensis
| (Roscoe) Baker | Fl. Brit. India 6(18): 250 | 1892 |
| Costaceae | |
Costus speciosus var. sericeus
| (Blume) K. Schum. | Bot. Jahrb. Syst. 27: 343 | 1899 |