Danser listed four herbarium specimens that he identified as belonging to N. villosa. These include two collected by George Darby Haviland from Mount Kinabalu in 1892. One of these, Haviland 1656/1232, was collected at an elevation of . It includes male floral material and is deposited at the Herbarium of the Sarawak Museum. The second specimen, Haviland 1813/1353, was collected from the Marai Parai plateau at an elevation of ; it likely represents N. edwardsiana. It is also deposited at the Herbarium of the Sarawak Museum. It does not include floral material. G. D. Haviland explored the Mount Kinabalu area with his brother H. A. Haviland between March and April, 1892, and must have collected these specimens during this time.