| Collector | La-ongsri, W. |
| Number | 3313 |
| Collected with | P. Panyachan, P. Tatiya, S. Satatha, S. Apibanwana |
| Country | Thailand |
| Subpart | Phayao |
| County | |
| Locality | Natural trail in Ban Huak, Phu Sang National Park Phu Sang District |
| Coordinates | |
| Minimum elevation (m) | 701 |
| Maximum elevation (m) | 701 |
| Start date | 2015/04/01 |
| End date | 2015/04/01 |
| Family | Euphorbiaceae |
| Identification | Trigonostemon thyrsoideus Stapf |
| Determined by | |
| Identification qualifier | |
| Field notes | Tree 5 m high by stream in evergreen forest. Flowers yellow. |
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