Pieter Willem Korthals (1 September 1807, AmsterdamMarch 1892, Haarlem) was a Dutch botanist. Korthals was the official botanist with the Dutch East India Service from 1831 to 1836. Among his many discoveries was the medicinal plant Kratom (Mitragyna speciosa). Korthals wrote the first monograph on the tropical pitcher plants, "Over het geslacht Nepenthes", published in 1839. Korthals, P.W. 1839. Over het geslacht Nepenthes. In: C.J. Temminck 1839–1842. Verhandelingen over de Natuurlijke Geschiedenis der Nederlandsche overzeesche bezittingen; Kruidkunde. Leiden. pp. 1–44, t. 1–4, 13–15, 20–22.
Carl Ludwig Blume named the botanical genus Korthalsia (family Arecaceae) after Korthals,Palms of Southern Asia by Andrew Henderson and Philippe Édouard Léon Van Tieghem introduced the genus name Korthalsella (family Santalaceae) in his honor.Plant Disease Jan. 2009 PD-62 Hawaiian Mistletoes (Korthalsella Species) Bulbophyllum korthalsii was named after him.
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