Nils Johan Andersson, born on 20 February 1821 in Gärdserum, Småland, Sweden, was a distinguished botanist and traveler whose contributions to the field of botany are still recognized today. He pursued his studies at Uppsala University from 1840 to 1845, culminating in a Doctor of Science degree. His academic journey laid the foundation for a career that would see him become a prominent figure in botanical research and education.
In 1851, Andersson embarked on a significant expedition as the botanist aboard the frigate HSwMS Eugenie, which marked the first Swedish circumnavigation. Under the command of Captain Christian Adolf Virgin, the voyage took him to various exotic locales, including Honolulu, Tahiti, San Francisco, Sydney, and Manila, as well as several South American ports and the Galapagos Islands. During this journey, he collected specimens at the Cape of Good Hope in April 1853, enriching his botanical knowledge and collections.
Upon returning to Sweden, Andersson was appointed Professor of Botany at Lund University and took on the role of director at the Botanical Department of the Swedish Museum of Natural History and the Hortus Bergianus in Stockholm. His research primarily focused on the families Salix, Cyperaceae, and Gramineae, leading to numerous publications on their systematics and morphology. He also edited significant works such as Flora Lapponica exsiccata and Våra bästa mat-lafvar, which provided guidance on the identification and collection of common edible algae.
In 1875, he made a notable acquisition on behalf of the Swedish Museum of Natural History, obtaining Sonder's South African collection, which comprised approximately one hundred thousand specimens. His legacy is further commemorated in the botanical genus Anderssoniopiper, although there are uncertainties regarding the type locality of one of its species, Anderssoniopiper panamense, which may have been mislabelled during his travels.
Andersson's contributions to science were recognized when he was elected a member of the Royal Swedish Academy of Sciences in 1859, solidifying his status as a leading figure in the botanical community.