| Genus Name | Genus | Grex Name | Year | Author | |
|---|---|---|---|---|---|
| Add+ | Dendrobium | Den | forbesii | 1886 | Ridl. | 
| Add+ | Sayeria | Say | forbesii | 1983 | (Ridl.) Rauschert | 
| Add+ | Latourea | Latourea | forbesii | 1981 | (Ridl.) Brieger in F.R.R.Schlechter | 
| Add+ | Latourorchis | Latourorchis | forbesii | 1981 | (Ridl.) Brieger in F.R.R.Schlechter | 
| Add+ | Dendrobium | Den | ashworthiae | 1901 | O'Brien | 
| Add+ | Dendrobium | Den | eustachyum | 1923 | Schltr. |