| Collector | Asanza, E. |
| Number | 41223 |
| Collected with | Barfod, A. |
| Country | Ecuador |
| Subpart | NAPO |
| County | |
| Locality | Cuyabeno Nature Reserve, Laguna Cuñangueno. Collections made from canoe on the lake. pH of the black water: 4.0-5.0. |
| Coordinates | 0° 2' N 76° 10' W |
| Minimum elevation (m) | 240 |
| Maximum elevation (m) | 240 |
| Start date | 1982/11/14 |
| End date | 1982/11/14 |
| Family | Hydrocharitaceae |
| Identification | Elodea mathewsii (Planchon)St. John |
| Determined by | |
| Identification qualifier | |
| Field notes | Floating mats on the lake. Flowers white. |
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