Culver‘s Holothrix (Holothrix culveri)
Culver’s Holothrix, described in 1905, is a very inconspicuous orchid species that is known exclusively from the type collection, originating from 1890.
The type locality is located close to what today is the town of Barberton in the Mpumalanga Province of South Africa, and is now completely destroyed by a road that was built right across the site, the habitat is heavily degraded due to spread of informal settlements.
Thus, the species is considered most likely extinct. However, search operations undertaken repeatedly between 2002 and 2006 produced the finding of at least one plant that may be this species, yet there is only this single plant, and its identity has obviously not been confirmed ever since.
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(public domain)
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edited: 20.03.2018