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Jens Vahl Jens Laurentius Moestue Vahl (1796–1854) was a Danish botanist and pharmacist. He was son of the Danish-Norwegian botanist and zoologist Martin Vahl. Jens Vahl graduated as a pharmacist in 1819 and then started studying botany and chemistry. == Greenlandic exploration == Vahl participated W. A. Graah's expedition to uninhabited areas of East Greenland in 1828-1830 with the purpose to search for the lost Eastern Norse Settlement. The expedition - in umiaks - was largely unsuccessful, but Vahl's botanical collections extended the previous knowledge much. Financial support from king Christian VIII of Denmark enabled Vahl to continue his investigations. So he travelled in West Greenland from 1829–1836, visiting all the Danish colonies from Julianehåb in the South to Upernavik in the North. He returned to Copenhagen in 1836 with very extensive plant collections, which he later donated to the University of Copenhagen. The Vahl collections added several lengths to the previous investigations by Paul Egede, Morten Wormskjold and others, and effectively laid the foundation of knowledge about the flora of Greenland. In contrast to his predecessors, Vahl made meticulous notes on the finding circumstances, like exact location and habitat of the plants. In 1838-1839, Vahl participated in a French expedition (Joseph Paul Gaimard) to Nordkapp and Spitsbergen. In 1840, he was made assistant at the Botanic Garden in Copenhagen. He described many new species, e.g. Draba arctica,〔(IPNI query )〕 but he did not finish the planned Greenlandic flora before his death. His successor, Johan Lange, picked up the task two decades later, which resulted in the first Flora of Greenland - the ''Conspectus Florae Groenlandicae'' (1887–1894).
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