| Collector | Larsen, K. |
| Number | 41190 |
| Collected with | S. S. Larsen, A. S. Barfod, W. Nanakorn, W. Ueachirakan & P. Sirirugsa. |
| Country | Thailand |
| Subpart | SATUN |
| County | |
| Locality | Yar Roy waterfall, c 25 km NE of Satun. Along stream and waterfall. |
| Coordinates | 6° 45' N 100° 7' E |
| Minimum elevation (m) | 100 |
| Maximum elevation (m) | 200 |
| Start date | 1990/11/06 |
| End date | 1990/11/06 |
| Family | Lamiaceae |
| Identification | Rotheca serrata (L.) Steane & Mabb. |
| Determined by | C. Leeratirwong |
| Identification qualifier | |
| Field notes | Along waterfall. Flowers pale blue. |
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