| Collector | Madsen, J. E. |
| Number | 50209 |
| Collected with | |
| Country | Ecuador |
| Subpart | EL ORO |
| County | |
| Locality | Road Huaquillas - Arenillas, km 2 from Huaquillas. Dry forest, dominated by arborescent cacti. |
| Coordinates | 3° 30' S 80° 13' W |
| Minimum elevation (m) | 0 |
| Maximum elevation (m) | 50 |
| Start date | 1984/02/16 |
| End date | 1984/02/16 |
| Family | Cactaceae |
| Identification | Praecereus euchlorus subsp. diffusus (Britton & Rose)Taylor |
| Determined by | Madsen, J. E. (AAU), 2002. |
| Identification qualifier | |
| Field notes | Growing up through dense vegetation. Ribs 8. Spines grey with black tips. Most plants severely marked by fire. |