| Collector | Lojtnant, B. |
| Number | 13312 |
| Collected with | Molau, U. |
| Country | Ecuador |
| Subpart | PASTAZA |
| County | |
| Locality | Montalvo, within the military camp. Fields, hedgerows, and lawns with small ditches. |
| Coordinates | 2° 5' S 76° 58' W |
| Minimum elevation (m) | 250 |
| Maximum elevation (m) | 250 |
| Start date | 1979/05/17 |
| End date | 1979/05/22 |
| Family | Onagraceae |
| Identification | Ludwigia hyssopifolia (G. Don)Exell |
| Determined by | Elsa Zardini, 1986 |
| Identification qualifier | |
| Field notes | Spreading herb, 0.5-1 m high. Corolla yellow. Fruits and stems red. |
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