The first known collection of "N. spectabilis" was made by Julius August Lörzing in 1920. The specimen "Lörzing 7308" was collected on June 5, 1920, on Mount Sibajak at an altitude of 1800 to 1900 m. It is deposited at the Bogor Botanical Gardens (formerly the Herbarium of the Buitenzorg Botanic Gardens) along with two isotypes which include both male and female floral material. A third isotype, sheet H.L.B. 928.350-170, is held at the National Herbarium of the Netherlands in Leiden and includes female floral material.