(Source: Flora Malesiana ser. 1, 1: Cyclopaedia of collectors)



Is cited as the collector of Adenia (Passifloraceae) and several Convolvulaceae on Prinseneiland,1 situated off the coast of SW. Java; the cited material in Herb. Leiden [L].

Recently Dr S.J. van Ooststroom suspected that something might be wrong regarding the collecting locality, though the concerned Convolvulaceae are all circumtropic. His supposition that the plants were rightly collected in Ilha do Principe, off the W. coast of Africa, is confirmed by another plant collected by Keulemans, viz Ouratea nutans (Hiern) Exell, a local-endemic, confined to the Isle of Principe in the Bay of Guinea. The collector, J.G. Keulemans, accompanied the German ornithologist H. Dohrn on a voyage to the Cape Verde Islands and Ilha do Principe (Prins-eiland in Dutch). Keulemans was a well-known draughtsman of birds, who for several years was employed in the Leiden Museum of Natural History.2



(1) cf. Hallier in Meded. ‘s Rijks Herb. Leiden no 42, 1922, p. 10, and van Ooststroom in Blumea 3, 1939, p. 337 etc.

(2) For more detailed data cf. S.J. van Ooststroom & C.G.G.J. van Steenis: ‘Keulemans’s collection from “Prinseneiland” (Java) is an unknown collection of plants from I. do Principe (W. Africa)’ (MS. to be published in Bull. Bot. Gard. Buit. 3rd ser., vol. 18).