Ceylon Sophora (Sophora zeylanica)
This species from the island of Sri Lanka appears in lists that deal with extinct plant species and is thus mentioned here. [1]
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Unfortunately, I cannot say anything further about this species, it may indeed be extinct.
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References:
[1] The 2007 Red List of Threatened Fauna and Flora of Sri Lanka, Colombo, Sri Lanka. XIII+ 148 pp. IUCN Sri Lanka and the Ministry of Environment and Natural Resources 2007
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(public domain)
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edited: 20.03.2018