In 1884 James Trail described B. leptocarpa in an article by Everard F. im Thurn, based on a specimen collected by im Thurn in Guyana.
In December 1884 he led the first successful expedition to the summit of Mount Roraima, in Venezuela's Gran Sabana region, along with Harry Perkins, an Assistant Crown Surveyor who was also living in British Guiana.
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He remained in this post until 1882, and later became a Stipendiary Magistrate in Pomeroon.
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