The name Euphorbia poissonii does not appear in widely accessible taxonomic databases, botanical literature, or major plant reference works as a formally recognized species or synonym within the genus Euphorbia. Consequently, there is no verifiable encyclopedic information regarding its morphological characteristics, native range, ecological preferences, or taxonomic history.
Possible etymology
The specific epithet poissonii is likely derived from the French surname “Poisson,” which is a common practice in botanical nomenclature to honor a person (e.g., a collector, botanist, or patron). The suffix “‑ii” indicates a Latinized genitive form meaning “of Poisson.” Without further contextual evidence, the precise individual commemorated by this epithet cannot be identified.
Conclusion
Given the lack of reliable, published sources, Euphorbia poissonii is not currently recognized as a valid or widely documented taxon in the scientific community. Further research in specialized herbarium records or unpublished taxonomic revisions would be required to determine whether the name has been applied informally, remains a nomen nudum, or corresponds to a synonym of an already described Euphorbia species.