Nepenthes Beccariana - Botanical History

Botanical History

The type specimen of N. beccariana was collected by Italian explorer Elio Modigliani during an 1886 expedition to Nias, an island located approximately 120 km from the port town of Sibolga in Sumatra. It is designated as E.Modigliani s.n. and is specimen FI-HB 7485 at the Herbarium Beccarianum in Florence, Italy. The type specimen consists of fragments of three leaves and three pitchers (two rosette pitchers and one upper pitcher) and is in a damaged state, with the leaves separated from the stem in such a way that their form of attachment is unknown.

Nepenthes beccariana was formally described by John Muirhead Macfarlane in his 1908 monograph, "Nepenthaceae". It is named in honour of Italian naturalist Odoardo Beccari. Macfarlane's description includes a line drawing of N. beccariana, showing a leaf blade, a lower pitcher, and an upper pitcher. It has been suggested that the upper pitcher in this illustration actually represents a composite, with features of both lower and upper pitchers.

Twenty years later, B. H. Danser synonymised the taxon with N. mirabilis in his seminal monograph, "The Nepenthaceae of the Netherlands Indies". With regards to the taxonomic status of N. beccariana, Danser wrote:

N. tubulosa and N. Beccariana of Macfarlane show important differences with the common N. mirabilis; yet I think them to be extreme variations of the latter. N. Beccariana differs from N. mirabilis only by the other shape of the pitchers. I have not seen type material, which is collected in P. Nias, but in the Buitenzorg Herbarium there are wholly congruent plants from the neighbouring P. Sibéroet, which undoubtedly are plants of N. mirabilis, showing the peculiar character, that the upper pitchers have the shape and the wings of the lower pitchers of the common form. N. tubulosa, N. Beccariana and N. Rowanae nearly show the extremes of the variation in the pitcher shape of N. mirabilis.

However, Danser never saw the type specimen of N. beccariana; his inclusion of the taxon within N. mirabilis was based solely on herbarium material. In their 1997 monograph, "A skeletal revision of Nepenthes (Nepenthaceae)", Matthew Jebb and Martin Cheek included N. beccariana as a synonym of N. mirabilis, having not examined the type specimen either. The authors retained this synonymy in their 2001 monograph, "Nepenthaceae".

In 2000, Jan Schlauer and C. Nepi examined the type specimen of N. beccariana and noted significant differences between it and N. mirabilis, suggesting that it should be restored as a distinct species. In Nepenthes of Sumatra and Peninsular Malaysia, Charles Clarke agreed that N. beccariana appears to be distinct from both N. mirabilis and N. sumatrana, but noted that if N. beccariana is found to be conspecific with N. longifolia, the latter taxon would become a heterotypic synonym of the former.