兩眼豬籠草[2]（學名：Nepenthes reinwardtiana）是婆羅洲和蘇門答臘特有的熱帶食蟲植物[3]，少量分布於周圍的許多島嶼中，包括邦加島、大納土納島[4]、尼亞斯島及西比路島。[5]雖然部分文獻顯示其分布於西馬來西亞[6][7][8][9]和新加坡[7][10]，但這些記錄似乎是錯誤的[11][12]。其種加詞「reinwardtiana」來源於卡斯珀·格奧爾格·卡爾·瑞華德，所以其也稱為瑞華德豬籠草（Reinwardt's Pitcher-Plant）。[13]
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兩眼豬籠草分布於海拔0至2200米處。[3]高海拔地區與低海拔地區兩眼豬籠草的捕蟲籠大小和顏色存在差異，低海拔變型的捕蟲籠更細長，高海拔地區的捕蟲籠更矮胖。[2]兩眼豬籠草的捕蟲籠色彩豐富，可為綠色至深紅色。兩眼豬籠草捕蟲籠的內表面可存在兩個「眼點」，其隨植株生長狀態，或存在或消失。[2]
2006年，朱馬特·哈吉·亞當和哈菲查·A·哈米德（Hafiza A. Hamid）描述了納奎友丁豬籠草（N. naquiyuddinii）[注 1]。[14][15]納奎友丁豬籠草存在於婆羅洲沙巴由根地咬去往金馬尼士的道路及土魯斯瑪迪山山腳，海拔1400米至1425米的開闊次生植被中。[14]
雖然兩眼豬籠草和納奎友丁豬籠草之間存在密切的近緣關係，但朱馬特·哈吉·亞當和哈菲查·A·哈米德認為「因為兩眼豬籠草和納奎友丁豬籠草存在許多形態上的差異，所以他們不能歸為同一個物種」。[14]但是另一些學者認為，兩眼豬籠草和納奎友丁豬籠草之間的差異太小了，不足以將它們區分成兩個物種，並認為納奎友丁豬籠草是兩眼豬籠草的同物異名。[16][17]此外，這些學者認為納奎友丁豬籠草可能是暗色豬籠草（N. fusca）和兩眼豬籠草的自然雜交種。[18]
2001年，查爾斯·克拉克對來自蘇門答臘島和西馬來西亞的豬籠草進行了分支系統學分析，共利用了70個形態特徵。以下為豬籠草進化樹的「第6分支」。[19]
- Nepenthes reinwardtiana var. samarindaensis J.H.Adam & Wilcock (1993)[20]
左：暗色豬籠草與兩眼豬籠草的自然雜交種。
右：兩眼豬籠草與窄葉豬籠草的自然雜交種。
納奎友丁豬籠草的種加詞來源於馬來西亞國民大學的副校監——Yang Amat Mulia Tunku Laxamana Tunku Dato' Seri Utama Naquiyuddin Ibni Tuanku Ja'afar.[14]
（印尼文） Mansur, M. 2012. Keanekaragaman jenis tumbuhan pemakan serangga dan laju fotosintesisnya di Pulau Natuna. [Diversity on insectivorous plants and its photosynthetic rate in Natuna Island.] Berita Biologi 11(1): 33–42. Abstract （頁面存檔備份，存於網際網路檔案館） Macfarlane, J.M. 1908. Nepenthaceae. In: A. Engler. Das Pflanzenreich IV, III, Heft 36: 1–91. Holttum, R.E. 1940. Malayan pitcher-plants. Malayan Nature Journal 1: 35–44.
Green, S. 1967. Notes on the distribution of Nepenthes species in Singapore. The Gardens' Bulletin Singapore 22: 53–65.
Adam, J.H. & C.C. Wilcock 1993. A new variety of Nepenthes reinwardtiana Miquel from Kalimantan, Borneo. Edinburgh Journal of Botany 50(1): 99–104.
- Adam, J.H. 1997. Prey spectra of Bornean Nepenthes species (Nepenthaceae) in relation to their habitat.PDF Pertanika Journal of Tropical Agricultural Science 20(2–3): 121–134.
- Adam, J.H. & C.C. Wilcock 1999. Palynological study of Bornean Nepenthes (Nepenthaceae).PDF Pertanika Journal of Tropical Agricultural Science 22(1): 1–7.
- （印尼文） Akhriadi, P. 2007. Kajian taksonomi hibrid alami Nepenthes (Nepenthaceae) di Kerinci. Working paper, Andalas University, Padang. Abstract
- Bauer, U., C.J. Clemente, T. Renner & W. Federle 2012. Form follows function: morphological diversification and alternative trapping strategies in carnivorous Nepenthes pitcher plants. Journal of Evolutionary Biology 25(1): 90–102. doi:10.1111/j.1420-9101.2011.02406.x
- Beaman, J.H. & C. Anderson 2004. The Plants of Mount Kinabalu: 5. Dicotyledon Families Magnoliaceae to Winteraceae. Natural History Publications (Borneo), Kota Kinabalu.
- Bourke, G. 2010. The climbing pitcher plants of the Kelabit highlands.PDF Captive Exotics Newsletter 1(1): 4–7.
- Bourke, G. 2011. The Nepenthes of Mulu National Park. Carniflora Australis 8(1): 20–31.
- Clarke et al. Nepenthes reinwardtiana. The IUCN Red List of Threatened Species 2000. [12 May 2006].
- Damayanti, F., M. Mansur & I. Roostika 2011. Diversity of Nepenthes spp. in West Kalimantan. （頁面存檔備份，存於網際網路檔案館） International Journal of Biodiversity and Conservation 3(13): 705–708.
- （印尼文） Deswita, E. 2010. Perkembangan ginesium beberapa jenis Nepenthes (N. ampullaria Jack., N. gracilis Korth. dan N. reinwardtiana Miq.). Thesis, Andalas University, Padang. Abstract
- Fretwell, S. 2013. Back in Borneo for giant Nepenthes. Part 1: Mesilau Nature Reserve, Ranau. Victorian Carnivorous Plant Society Journal 107: 6–13.
- Fretwell, S. 2013. Back in Borneo to see giant Nepenthes. Part 3: Mt. Trusmadi and Mt. Alab. Victorian Carnivorous Plant Society Journal 109: 6–15.
- （印尼文） Handayani, T. 1999. Konservasi Nepenthes di kebun raya Indonesia.PDF [Conservation of Nepenthes in Indonesian botanic gardens.] In: A. Mardiastuti, I. Sudirman, K.G. Wiryawan, L.I. Sudirman, M.P. Tampubolon, R. Megia & Y. Lestari (eds.) Prosiding II: Seminar Hasil-Hasil Penelitian Bidang Ilmu Hayat. Pusat Antar Universitas Ilmu Hayat IPB, Bogor. pp. 365–372.
- （印尼文） Hartini, S. 2007. Keragaman flora dari Monumen Alam Kersik Luway, Kalimantan Timur.（頁面存檔備份，存於網際網路檔案館） [Flora diversity from Kersik Luway Nature Monument, East Kalimantan.] Biodiversitas 8(1): 67–72.
- Hernawati & P. Akhriadi 2006. A Field Guide to the Nepenthes of Sumatra. PILI-NGO Movement, Bogor.
- Kato, M., M. Hotta, R. Tamin & T. Itino 1993. Inter- and intra-specific variation in prey assemblages and inhabitant communities in Nepenthes pitchers in Sumatra. Tropical Zoology 6(1): 11–25. Abstract
- Lee, C.C. 2000. Recent Nepenthes Discoveries（頁面存檔備份，存於網際網路檔案館）. [video] The 3rd Conference of the International Carnivorous Plant Society, San Francisco, USA.
- Lee, C.C. 2002. Nepenthes species of the Hose Mountains in Sarawak, Borneo.PDF Proceedings of the 4th International Carnivorous Plant Conference, Hiroshima University, Tokyo: 25–30.
- Macfarlane, J.M. 1914. Family XCVI. Nepenthaceæ.（頁面存檔備份，存於網際網路檔案館） [pp. 279–288] In: J.S. Gamble. Materials for a flora of the Malayan Peninsula, No. 24.（頁面存檔備份，存於網際網路檔案館） Journal & Proceedings of the Asiatic Society of Bengal 75(3): 279–391.
- （印尼文） Mansur, M. 2001. Koleksi Nepenthes di Herbarium Bogoriense: prospeknya sebagai tanaman hias.PDF In: Prosiding Seminar Hari Cinta Puspa dan Satwa Nasional. Lembaga Ilmu Pengetahuan Indonesia, Bogor. pp. 244–253.
- （印尼文） Mansur, M. 2007. Keanekaragaman jenis Nepenthes (kantong semar) dataran rendah di Kalimantan Tengah. [Diversity of lowland Nepenthes (kantong semar) in Central Kalimantan.] Berita Biologi 8(5): 335–341. Abstract
- McPherson, S.R. & A. Robinson 2012. Field Guide to the Pitcher Plants of Borneo. Redfern Natural History Productions, Poole.
- Meimberg, H., A. Wistuba, P. Dittrich & G. Heubl 2001. Molecular phylogeny of Nepenthaceae based on cladistic analysis of plastid trnK intron sequence data. Plant Biology 3(2): 164–175. doi:10.1055/s-2001-12897
- Meimberg, H. & G. Heubl 2006. Introduction of a nuclear marker for phylogenetic analysis of Nepenthaceae. Plant Biology 8(6): 831–840. doi:10.1055/s-2006-924676
- Meimberg, H., S. Thalhammer, A. Brachmann & G. Heubl 2006. Comparative analysis of a translocated copy of the trnK intron in carnivorous family Nepenthaceae. Molecular Phylogenetics and Evolution 39(2): 478–490. doi:10.1016/j.ympev.2005.11.023
- （印尼文） Meriko, L. 2010. Perkembangan androesium beberapa jenis Nepenthes (N. ampullaria Jack., N. gracilis Korth. dan N. reinwardtiana Miq.). M.Sc. thesis, Andalas University, Padang. Abstract
- （日語） Oikawa, T. 1992. Nepenthes reinwardtiana Miq.. In: Muyū kusa – Nepenthes（無憂草 – Nepenthes）. [The Grief Vanishing.] Parco Co., Japan. pp. 40–41.
- Renner, T. & C.D. Specht 2011. A sticky situation: assessing adaptations for plant carnivory in the Caryophyllales by means of stochastic character mapping. International Journal of Plant Sciences 172(7): 889–901. doi:10.1086/660882
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- （印尼文） Syamsuardi & R. Tamin 1994. Kajian kekerabatan jenis-jenis Nepenthes di Sumatera Barat. Project report, Andalas University, Padang. Abstract
- （印尼文） Syamsuardi 1995. Klasifikasi numerik kantong semar (Nepenthes) di Sumatera Barat. [Numerical classification of pitcher plants (Nepenthes) in West Sumatra.] Journal Matematika dan Pengetahuan Alam 4(1): 48–57. Abstract
- （印尼文） Syamswisna 2009. Analisis vegetasi pada habitat kantong semar (Nepenthes reinwardtiana Miq.) di Paninjauan, Kabupaten Solok.M.Sc. thesis, Andalas University, Padang.
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- Yogiara, A. Suwanto & M.T. Suhartono 2006. A complex bacterial community living in pitcher plant fluid（頁面存檔備份，存於網際網路檔案館）. Jurnal Mikrobiologi Indonesia 11(1): 9–14.
- （印尼文） Yusmad , R. 2008. Stuktur anatomi daun dan sulur serta perkembangan kantung pada kantung semar (Nepenthes reinwardtana Miq). M.Sc. thesis, Andalas University, Padang. Abstract
