Euphorbia poissonii is an erect much-branched succulent shrub with stout, cylindrical, silvery-grey branches with large pale green leaves …
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Epithet: poissonii
Derivation: Honors Henri Louis Poisson (1877–1963), a French botanist.
Pronunciation: poy-SON-ee-eye
While the generic name must be unique, two or more genera often share the same specific epithet. Moreover, the same epithet can be used for subspecies, varieties, and forms within a species. Here is a list of plants that share this epithet.