West Virginia Blackberry (Rubus concameratus)
The West Virginia Blackberry was described in 1953, as it name implies, it is only found in West Virginia, USA, where it is known from five counties, however all reports are historic with the latest one dating from 1957.
The West Virginia Blackberry thus might be extinct.
However, this species is not recognized by all botanists and is sometimes considered a synonym of the Allegheny Blackberry (Rubus allegheniensis (Porter) Porter) (see photo).
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Photo: Famartin
(under creative commons license (4.0))
http://creativecommons.org/licenses/by-sa/4.0
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edited: 16.04.2019