Linnaeus travelled clockwise around the coast of the Gulf of Bothnia , making major inland incursions from Umeå , Luleå and Tornio . He returned from his six-month-long, over 2,000 kilometres (1,200 mi) expedition in October, having gathered and observed many plants, birds and rocks.    Although Lapland was a region with limited biodiversity , Linnaeus described about 100 previously unidentified plants. These became the basis of his book Flora Lapponica .   However, on the expedition to Lapland, Linnaeus used Latin names to describe organisms because he had not yet developed the binomial system.