| Collector | Thammarong, W. |
| Number | 3659 |
| Collected with | S. Rakarcha, S. Yokyo, M. Tabut |
| Country | Thailand |
| Subpart | Sukhothai |
| County | |
| Locality | Pha Cho, Ban Mae San, Mae Sam, Mae Sam Sub-District, Si Satchanalai district |
| Coordinates | |
| Minimum elevation (m) | 370 |
| Maximum elevation (m) | 575 |
| Start date | 2022/07/19 |
| End date | 2022/07/19 |
| Family | Polygalaceae |
| Identification | Polygala umbonata Craib |
| Determined by | |
| Identification qualifier | |
| Field notes | Ecology: mixed deciduous forest in limestone mountain. Herb. Flower yellow. |