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|}} ''Nepenthes dubia'' is a tropical pitcher plant endemic to Sumatra, where it grows at an altitude of 1600–2700 m above sea level.〔McPherson, S.R. & A. Robinson 2012. ''Field Guide to the Pitcher Plants of Sumatra and Java''. Redfern Natural History Productions, Poole.〕 The specific epithet ''dubia'' is the Latin word for "doubtful". ==Botanical history== ''Nepenthes dubia'' was first collected on May 29, 1917 by H. A. B. Bünnemeijer on Mount Talakmau, at an altitude of around 1900 m above sea level.〔 Eleven years later, B. H. Danser formally described ''N. dubia'' in his seminal monograph "The Nepenthaceae of the Netherlands Indies". Danser noted similarities between ''N. dubia'' and the closely related ''N. inermis'' and suggested that it might represent a natural hybrid involving this species.〔〔Clarke, C.M. 2006. Introduction. In: Danser, B.H. ''The Nepenthaceae of the Netherlands Indies''. Natural History Publications (Borneo), Kota Kinabalu. pp. 1–15.〕 He wrote:〔 ''N. dubia'' strongly resembles the striking ''N. inermis'', but the difference is too large to unite these two species. ''N. inermis'', like ''N. Lowii'' has only a rudiment of a peristome. ''N. dubia'' has a broad and flat one. There are, however, also differences in the other parts: the pitchers are less widely infundibuliform and the lid is not so narrow as in ''N. inermis''. Perhaps ''N. dubia'' is a hybrid of ''N. inermis'' and another species with normal peristome and in that case ''N. Bongso'' could be the other parent species, the more so as the vegetative parts of ''N. inermis'', ''N. dubia'' and ''N. Bongso'' are very similar, and between the other species of the ''gymnamphora''-group intermediate forms often occur. Danser based his description on the specimen collected in 1917, ''Bünnemeijer 938''. It consists of a portion of a climbing stem with upper pitchers. The specimen is deposited at the Bogor Botanical Gardens (formerly the Herbarium of the Buitenzorg Botanic Gardens) in Java and Herbarium Lugduno-Batavum in Leiden, Netherlands.〔 ''Bünnemeijer 938'' was later designated as the lectotype of ''N. dubia'' by Matthew Jebb and Martin Cheek.〔 Renewed interest in ''Nepenthes'' in the latter half of the 20th century saw ''N. dubia'' become the subject of both confusion and taxonomic revision. In an article published in 1973 on the ''Nepenthes'' of Borneo, Singapore, and Sumatra,〔 botanist Shigeo Kurata incorrectly identified specimens of a natural cross between ''N. inermis'' and ''N. talangensis'' as belonging to ''N. dubia''.〔 Kurata would later describe this hybrid as a new species, ''N. pyriformis''.〔 Kurata, S. 2001. スマトラ島およびミンダナオ島産ウツボカズラの２新種(英文). (new species of ''Nepenthes'' from Sumatra (Indonesia) and Mindanao (Philippines). ) ''The Journal of Insectivorous Plant Society'' 52(2): 30–34.〕 In 1986, Mitsuru Hotta and Rusjdi Tamin included plant material belonging to ''N. dubia'' and ''N. inermis'' in their description of ''N. bongso''.〔〔 However, ''N. bongso'' differs considerably in pitcher morphology from these species and is not easily confused with them. In 1997, Matthew Jebb and Martin Cheek published their monograph "A skeletal revision of ''Nepenthes'' (Nepenthaceae)", in which they referred to ''N. dubia'' specimens from Mount Talang (''Kurata s.n.'' SING) and the mountains of the Tjampo region near Payakumbuh (''Meijer 6949'' L). The latter specimen is the holotype of ''N. tenuis'', which Jebb and Cheek treated in synonymy with ''N. dubia''.〔 However, subsequent authors have rejected this interpretation. Charles Clarke restored ''N. tenuis'' to species rank in ''Nepenthes of Sumatra and Peninsular Malaysia'' (2001), citing differences in pitcher morphology. Clarke also identified ''Kurata s.n.'' as the natural hybrid ''N. × pyriformis'', which is similar to ''N. dubia'', but can be distinguished on the basis of several stable characters. The hybrid has a wider pitcher lid that is never relfexed beyond 90 degrees and the pitcher cup is not appressed in the lower parts as in ''N. dubia''. In addition, the mouth of ''N. × pyriformis'' is raised towards the back as opposed to being horizontal.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nepenthes dubia」の詳細全文を読む スポンサード リンク
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