The Parnassia (Parnassiaceae) from Mt Leuser in N Sumatra, provisionally known as Parnassia aff. wightiana, is described as Parnassia procul.

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Blumea: Biodiversity, Evolution and Biogeography of Plants

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Naturalis journals & series

Turner, H, & Veldkamp, J.F. (2001). Parnassia (Parnassiaceae) in North Sumatra. Blumea: Biodiversity, Evolution and Biogeography of Plants, 46(3), 599–603.