A new species of orchid has been discovered in the Pakaraima Mountains, atop the majestic Kamarau Falls, Kurupung River. The new species named Sobralia pakaraimense was found during field studies by the University of Gdansk in 1992, but has only now been described as a distinct species. Eight species of the genus Sobralia are now known from Guyana.
Guyana Conservation Network | GuyCoN 
Unfortunatelly, the species wasn’t discovered during the fieldwork (I wish it would be possible) but as a result of herbarium material study.
Regards,
Przemyslaw Baranow