Linear-leaved Begonia (Begonia linearifolia)
The Linear-leaved Begonia was described in 1991, the species was apparently restricted to the vicinity of Santiago de Cuba, the second-largest city of Cuba.
The species appears in lists of extinct species and is thus also mentioned here, any additional information, however, is very welcome! [1]
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syn. Begonia stenophylla J. Sierra
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References:
[1] R. Berazaín: The extinct Flora of Cuba. Bissea 3(2). 2009
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edited: 04.09.2019