This came to me as T.melanoxylon – an extinct St.Helena endemic but has leaves whose top surface is hairless so is more likely to be T.ebenus (which is also critically endangered).. It has large white flowers, bush 1-2m.

Genus: TROCHETIOPIS
Variety: EBENUS
Cultivar: R20080221
Plant family: Malvaceae
Hardiness zone: H2 (1C to 5C)
Height: 

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Other data

Foilage colour
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Plant ID 17467