| Collector | Madsen, J. E. |
| Number | 50208 |
| 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 | Pilosocereus tweedyanus (Britton & Rose)Byles & G. Rowley |
| Determined by | J. Madsen, 1986 |
| Identification qualifier | |
| Field notes | Tree, to 8 m high. Joints erect, several meters long, bluish green. Ribs 7-8. Typical spination stronger than on the material collected. Cephalium whitish. Few withered flowers seen. Most plants severely marked by fire. |
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