Napo Fleabane (Erigeron adscendens)
The Napo Fleabane was described in 1851, the species was only ever found once, growing in wet wasteland at an elevation of 4000 to 4500 m somewhere at the foothills of the Antisana volcano in the Napo Province of Ecuador.
The species was never found since and might well be extinct.
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edited: 09.09.2019