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''Nepenthes ultra'' is a tropical pitcher plant native to the Philippine island of Luzon, where it grows at low altitude on ultramafic soils (hence the name).〔 ''Nepenthes ultra'' belongs to the informal "''N. alata'' group",〔 which also includes ''N. alata'', ''N. ceciliae'', ''N. copelandii'', ''N. extincta'', ''N. graciliflora'', ''N. hamiguitanensis'', ''N. kitanglad'', ''N. kurata'', ''N. leyte'', ''N. mindanaoensis'', ''N. negros'', ''N. ramos'', and ''N. saranganiensis''.〔Cheek, M. & M. Jebb 2013. Recircumscription of the ''Nepenthes alata'' group (Caryophyllales: Nepenthaceae), in the Philippines, with four new species. ''European Journal of Taxonomy'' 69: 1–23. 〕〔Cheek, M. & M. Jebb 2013. Typification and redelimitation of ''Nepenthes alata'' with notes on the ''N. alata'' group, and ''N. negros'' sp. nov. from the Philippines. ''Nordic Journal of Botany'' 31(5): 616–622. 〕〔Cheek, M. & M. Jebb 2013. ''Nepenthes ramos'' (Nepenthaceae), a new species from Mindanao, Philippines. ''Willdenowia'' 43(1): 107–111. 〕 These species are united by a number of morphological characters, including winged petioles, lids with basal ridges on the lower surface (often elaborated into appendages), and upper pitchers that are usually broadest near the base.〔〔 ==References== * Cheek, M. 2014. (12 new carnivorous plant species from the Philippines ). Kew Science Blog, 20 January 2014. * Mey, F.S. 2013. (''Nepenthes ultra'', yet another new species from the Philippines. ) ''Strange Fruits: A Garden's Chronicle'', November 6, 2013. * Smith, L. 2014. (Pitcher perfect - but carnivorous plants are at risk ). ''The Independent'', January 5, 2014. 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 ultra」の詳細全文を読む スポンサード リンク
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