| Collector | Holm-Nielsen, L. B. |
| Number | 19994 |
| Collected with | Jaramillo, J. & Coello, F. |
| Country | Ecuador |
| Subpart | NAPO |
| County | |
| Locality | Río Yasuní, Jatuncocha. Lake, lakeshore, and swamp in black water area with Macrolobium. |
| Coordinates | 1° 0' S 75° 28' W |
| Minimum elevation (m) | 280 |
| Maximum elevation (m) | 280 |
| Start date | 1979/08/27 |
| End date | 1979/08/27 |
| Family | Onagraceae |
| Identification | Ludwigia leptocarpa (Nutt.)Hara |
| Determined by | E. Zardini, 1986 |
| Identification qualifier | |
| Field notes | Bank vegetation. Flowers bright yellow. |
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