| Collector | Pongamornkul, W. |
| Number | 439 |
| Collected with | S. Watthana, R. Panya |
| Country | Thailand |
| Subpart | Chiang Mai |
| County | |
| Locality | Mae Kam Pong, Mae On District |
| Coordinates | |
| Minimum elevation (m) | 1100 |
| Maximum elevation (m) | 1100 |
| Start date | 1999/06/20 |
| End date | 1999/06/20 |
| Family | Apocynaceae |
| Identification | Zygostelma benthamii Baill. |
| Determined by | |
| Identification qualifier | |
| Field notes | Climber with woody stem at base in hill evergreen forest. Milkysap. Inflorescence axillary leaves. Corolla pink or purple. Stamen 5 merous. |