135–137. Rottloff, S., R. Stieber, H. Maischak, F.G. Turini, G. Heubl & A. Mithöfer 2011. Functional characterization of a class III acid endochitinase from the traps of the carnivorous pitcher plant genus, Nepenthes. Journal of Experimental Botany 62(13): 4639–4647. Shivas, R.G. 1984. Carnivorous Plant Newsletter 13(1): 10–15. Syamsuardi & R. Tamin 1994. Kajian kekerabatan jenis-jenis Nepenthes di Sumatera Barat. Project report, Andalas University, Padang. Abstract 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 Wistuba, A. & H. Rischer 1996. Nepenthes lavicola, a new species of Nepenthaceae from the Aceh Province in the North of Sumatra. Carnivorous Plant Newsletter 25(4): 106-111. External links A lower pitcher of N. singalana imaged using optical projection tomography Inner World of Nepenthes singalana from the John Innes Centre Carnivorous plants of Asia singalana Endemic flora of Sumatra Plants described in 1886 Taxa named by Odoardo Beccari