It is usually absent from larger, faster flowing rivers; however, it is able to survive conditions of high water velocity in the St . Lawrence River, and in the United States it may even be better adapted than the introduced species " Bithynia tentaculata " to such habitats.
32.
However, a number of populations of " N . tentaculata " from northern Sarawak produce pitchers exceeding 20 cm in height and these may be very similar in appearance to " N . murudensis " . " Nepenthes murudensis " also differs in that its aerial pitchers lack wings.
33.
One example of this appears in the article " " Nepenthes " of Gunung Murud ", authored by John De Witte and published in a 1996 issue of the " Carnivorous Plant Newsletter ", where an upper pitcher of " N . murudensis " is identified as " N . tentaculata ".
34.
It shares with this species the multicellular filiform appendages of the upper lid, as well as the general form of its laminae and pitchers . " Nepenthes hamata " clearly differs from " N . tentaculata " in the development of its peristome, which bears exaggerated flange-like extensions; " N . tentaculata " lacks conspicuous teeth altogether.
35.
It shares with this species the multicellular filiform appendages of the upper lid, as well as the general form of its laminae and pitchers . " Nepenthes hamata " clearly differs from " N . tentaculata " in the development of its peristome, which bears exaggerated flange-like extensions; " N . tentaculata " lacks conspicuous teeth altogether.
36.
In subsequent years, " N . tentaculata " was featured in a number of publications by eminent botanists such as Frederick William Burbidge ( 1882 ), Odoardo Beccari ( 1886 ), Ernst Wunschmann ( 1891 ), Otto Stapf ( 1894 ), G�nther Beck von Mannagetta und Lerchenau ( 1895 ), Jacob Gijsbert Boerlage ( 1900 ), Elmer Drew Merrill ( 1921 ), and Frederik Endert ( 1925 ).
37.
In their 2001 monograph, Martin Cheek and Matthew Jebb wrote that although the available herbarium material of " N . hamata " ( around seven collections at the time ) showed wide variation in peristome development, with some specimens appearing " very close to " N . tentaculata " ", this did not represent a continuum of intergrades between " N . hamata " at one extreme and " N . tentaculata " at the other, but rather was due to a combination of lower and upper pitchers ( the latter having more highly developed peristome teeth ).
38.
In their 2001 monograph, Martin Cheek and Matthew Jebb wrote that although the available herbarium material of " N . hamata " ( around seven collections at the time ) showed wide variation in peristome development, with some specimens appearing " very close to " N . tentaculata " ", this did not represent a continuum of intergrades between " N . hamata " at one extreme and " N . tentaculata " at the other, but rather was due to a combination of lower and upper pitchers ( the latter having more highly developed peristome teeth ).
