Euphorbia heleniana
Euphorbia heleniana or French grass or Saint Helena spurge is a herbaceous plant, a member of the Euphorbiaceae family. Distribution 
It is an endemic species to Saint Helena. Taxonomy 
It was named by Albert Thellung and Otto Stapf, in Bull. Misc. Inform. Kew 1916: 201 in 1916. References

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heleniana