| Collector | Holm-Nielsen, L. B. |
| Number | 21056 |
| Collected with | Jaramillo, J. & Brandbyge, J. |
| Country | Ecuador |
| Subpart | NAPO |
| County | |
| Locality | Río Aguarico, San Pablo de los Secoyas. Mature rain forest. |
| Coordinates | 0° 17' S 76° 26' W |
| Minimum elevation (m) | 235 |
| Maximum elevation (m) | 235 |
| Start date | 1980/02/13 |
| End date | 1980/02/13 |
| Family | Rubiaceae |
| Identification | Calycophyllum spruceanum (Benth.)Hook |
| Determined by | Andersson, L. (GB), 1993. |
| Identification qualifier | |
| Field notes | Tree with very smooth bark, 30-40 m tall. Bracts green, turning brown and light grey in sunlight. Flowers white. Anthers 8. With bordeaux hairs at base of stamens. |
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