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Nepenthes deaniana
''Nepenthes deaniana'' (; after Dean C. Worcester) is a tropical pitcher plant endemic to the Philippines, where it grows at an altitude of 1180–1296 m above sea level.〔McPherson, S.R. 2009. ''Pitcher Plants of the Old World''. 2 volumes. Redfern Natural History Productions, Poole.〕 The species is known only from the summit region of Thumb Peak, a relatively small, ultramafic mountain in Puerto Princesa Province, Palawan.
''Nepenthes deaniana'' has no known natural hybrids.〔 No forms or varieties have been described.
In his Carnivorous Plant Database, taxonomist Jan Schlauer treats ''N. gantungensis'', ''N. leonardoi'' and ''N. mira'' as heterotypic synonyms of ''N. deaniana''.〔Schlauer, J. (''Nepenthes deaniana'' ). Carnivorous Plant Database.〕
Adolph Daniel Edward Elmer recorded a plant from Mount Pulgar (now known as Thumb Peak) matching the description of ''N. deaniana''. He made mention of this discovery in the April 20, 1912 issue of ''Leaflets of Philippine Botany'', in his formal description of ''N. graciliflora'':〔Elmer, A.D.E. 1912. (Nepenthaceae. ) () In: (Two score of new plants ). ''Leaflets of Philippine Botany'' 4: 1475–1520.〕
Recently the writer () observed a large sterile species on mount Pulgar of Palawan. Some of its pitchers were a foot long and six inches thick!
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