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CCDB → Angiosperms → Rubiaceae → Exostema → Exostema subcordatum K. E. Urb.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Exostema subcordatum K. E. Urb. | Exostema subcordatum Krug & Urb. | 22 | Fedorov, 1974 | Fagerlind 1937 |