| Collector | La-ongsri, W. |
| Number | 3131 |
| Collected with | P. Panyachan, P. Tatiya, S. Satatha |
| Country | Thailand |
| Subpart | Phayao |
| County | |
| Locality | Ban Huak, Rom Yen Sub-district, Chiang Kham District |
| Coordinates | |
| Minimum elevation (m) | 0 |
| Maximum elevation (m) | 0 |
| Start date | 2014/01/23 |
| End date | 2014/01/23 |
| Family | Asclepiadaceae |
| Identification | Heterostemma siamicum Craib |
| Determined by | |
| Identification qualifier | |
| Field notes | Climber with white latex by roadside in dry evergreen forest. Fruits green. |
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