on a misinterpretation of type specimens; these two species do not seem closely related to each other. Infraspecific taxa N. alata f. variegata Hort. ex P.Mann (1996) nom.nud. N. alata var. biflora Macfarl. (1908) [=N. negros] N. alata var. ecristata Macfarl. (1908) [=N. kurata] Natural hybrids N. alata × N. burkei N. alata × N. merrilliana [=N. × merrilliata] ? (N. alata × N. merrilliana) × N. mirabilis [=N. × tsangoya] N. alata × N. mindanaoensis N. alata × N. mirabilis [=N. × mirabilata] ? N. alata × N. petiolata N. alata × N. pulchra N. alata × N. truncata [=N. × truncalata] N. alata × N. ventricosa [=N. × ventrata] References Further reading Alejandro, G.J.D., J.P.C. Baysa, B.O.C. Lemana, G.M. Madulara, R.S. Madulid & D.A. Madulid 2007. Conspecificity of Nepenthes alata Blco. population found in Mt. Guisguis, Zambales inferred from Internal Transcribed Spacer (nrDNA) sequence data. Acta Manilana 55: 15–21. Alejandro, G.J.D., R.S. Madulid & D.A. Madulid 2008. The utility of Internal Transcribed Spacer (nrDNA) sequence data for phylogenetic reconstruction in endemic Philippine Nepenthes L. (Nepenthaceae). The Philippine Scientist 45: 99–110. Amoroso, V.B. & R.A. Aspiras 2011. Hamiguitan Range: a sanctuary for native flora. Saudi Journal of Biological Sciences 18(1): 7–15. Amoroso, V.B., L.D. Obsioma, J.B. Arlalejo, R.A. Aspiras, D.P. Capili, J.J.A. Polizon & E.B. Sumile 2009. Inventory and conservation of endangered, endemic and economically important flora of Hamiguitan Range, southern Philippines. Blumea 54(1–3): 71–76. An, C.-I., E.-I. Fukusaki & A. Kobayashi 2001. Plasma-membrane H+-ATPases are expressed in pitchers of the carnivorous plant Nepenthes alata Blanco. Planta 212(4): 547–555. An, C.-I., E.-I. Fukusaki & A. Kobayashi 2002. Aspartic proteinases are expressed in pitchers of the carnivorous plant Nepenthes alata Blanco. Planta 214(5): 661–667. An, C.-I., S. Takekawa, A. Okazawa, E.-I. Fukusaki & A. Kobayashi 2002. Degradation of a peptide in pitcher fluid of the carnivorous plant Nepenthes alata Blanco. Planta 215(3): 472–477. 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. Bauer, U. & W. Federle 2009. The insect-trapping rim of Nepenthes pitchers: surface structure and function. Plant Signaling & Behavior 4(11): 1019–1023. Benz, M.J., E.V. Gorb & S.N. Gorb 2012. Diversity of the slippery zone microstructure in pitchers of nine carnivorous Nepenthes taxa. Arthropod-Plant Interactions 6(1): 147–158. Beveridge, N.G.P., C. Rauch, P.J.A. Keßler, R.R. van Vugt &