| TaxonId | Name | Volume | Year | ||
| 242344252 | Rhododendron oreodoxa var. oreodoxa | 山光杜鹃(原变种) | Vol.14 | 2005 | |
| 242344253 | Rhododendron oreodoxa var. shensiense | 陕西山光杜鹃 | Vol.14 | 2005 | |
| 242344254 | Rhododendron oreogenum | 藏东杜鹃 | Vol.14 | 2005 | |
| 200016512 | Rhododendron oreotrephes | 山育杜鹃 | Vol.14 | 2005 | |
| 242344255 | Rhododendron oresbium | Vol.14 | 2005 | ||
| 242344256 | Rhododendron oresterum | Vol.14 | 2005 | ||
| 242344257 | Rhododendron orthocladum | 直枝杜鹃 | Vol.14 | 2005 | |
| 242344258 | Rhododendron orthocladum var. longistylum | 长柱直枝杜鹃 | Vol.14 | 2005 | |
| 242344259 | Rhododendron orthocladum var. microleucum | Vol.14 | 2005 | ||
| 242344260 | Rhododendron orthocladum var. orthocladum | 直枝杜鹃(原变种) | Vol.14 | 2005 | |
| 200016513 | Rhododendron oulotrichum | Vol.14 | 2005 | ||
| 242344262 | Rhododendron ovatosepalum | Vol.14 | 2005 | ||
| 200016514 | Rhododendron ovatum | 马银花 | Vol.14 | 2005 | |
| 242414214 | Rhododendron ovatum var. lamprophyllum | Vol.14 | 2005 | ||
| 242344264 | Rhododendron ovatum var. prismatum | Vol.14 | 2005 |
