| Collector | Holm-Nielsen, L. B. |
| Number | 21159 |
| Collected with | Jaramillo, J. & Brandbyge, J. |
| Country | Ecuador |
| Subpart | NAPO |
| County | |
| Locality | Río Cuyabeno. 10 km upstream from Río Aguas Negras. Riverside forest. |
| Coordinates | 0° 10' S 75° 58' W |
| Minimum elevation (m) | 220 |
| Maximum elevation (m) | 220 |
| Start date | 1980/02/15 |
| End date | 1980/02/15 |
| Family | Apocynaceae |
| Identification | Prestonia quinquangularis (Jacq.) Spreng. |
| Determined by | Morales, J.F. (INB), 1998. |
| Identification qualifier | |
| Field notes | Flowers yellowish-green. |
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