Table 1.

The Nepenthes species studied and the mean (± s.e.) morphometric trait values of their leaves and pitchers

Species	Length (cm)		Width (cm)		Thickness (mm)		Tissue mass per area (g cm−2)		Tissue density (g cm−3)
	Leaf	Pitcher	Leaf	Pitcher†	Leaf	Pitcher	Leaf	Pitcher	Leaf	Pitcher
Nepenthes albomarginata	19·66 ± 1·99	9·52 ± 1·09	3·40 ± 0·27	2·89 ± 0·51	0·21 ± 0·01	0·36 ± 0·01	0·013 ± 0·002	0·011 ± 0·000	0·567 ± 0·070	0·316 ± 0·020
N. ampullaria	19·55 ± 2·44	6·06 ± 1·33	5·94 ± 0·33	4·81 ± 0·62	0·26 ± 0·02	0·32 ± 0·01	0·011 ± 0·001	0·008 ± 0·001	0·407 ± 0·026	0·256 ± 0·020
N. bicalcarata	37·06 ± 1·72	12·47 ± 0·94	8·03 ± 0·24	4·61 ± 0·44	0·27 ± 0·01	0·37 ± 0·01	0·013 ± 0·001	0·016 ± 0·002	0·508 ± 0·054	0·455 ± 0·054
N. gracilis	11·62 ± 2·44	8·23 ± 1·33	2·27 ± 0·33	1·47 ± 0·62	0·17 ± 0·02	0·17 ± 0·01	0·011 ± 0·001	0·006 ± 0·000	0·654 ± 0·058	0·339 ± 0·034
N. mirabilis	22·92 ± 3·44	13·07 ± 1·89	5·48 ± 0·47	2·93 ± 0·88	0·18 ± 0·02	0·32 ± 0·02	0·009 ± 0·001	0·011 ± 0·001	0·492 ± 0·090	0·326 ± 0·017
N. rafflesiana var. typical	14·84 ± 2·44	14·22 ± 1·33	5·40 ± 0·33	4·64 ± 0·62	0·30 ± 0·02	0·29 ± 0·01	0·013 ± 0·000	0·010 ± 0·001	0·418 ± 0·036	0·346 ± 0·013
N. rafflesiana var. elongata	13·53 ± 1·80	23·64 ± 0·99	3·36 ± 0·25	5·43 ± 0·46	0·23 ± 0·01	0·22 ± 0·01	0·011 ± 0·001	0·007 ± 0·000	0·498 ± 0·011	0·314 ± 0·016
N. rafflesiana var. gigantia	24·03 ± 2·25	24·76 ± 1·24	6·33 ± 0·31	8·19 ± 0·58	0·27 ± 0·01	0·28 ± 0·01	0·014 ± 0·001	0·011 ± 0·000	0·546 ± 0·030	0·422 ± 0·023
Mean	22·58 ± 1·35	15·08 ± 0·94	5·29 ± 0·27	4·50 ± 0·30	0·24 ± 0·01	0·29 ± 0·01	0·012 ± 0·000	0·010 ± 0·001	0·518 ± 0·020	0·357 ± 0·014
F-ratio amongst species within organs	34·78***	18·31***	11·79***	48·76***	33·87***	9·90***	1·25 n.s.	14·06***	2·42*	3·19**
F-ratio between organs	133·23***		9·62**		126·10***		8·20***		49·63**

Data are based on leaves and pitchers from six sites per species with four measurements per site. *P < 0·05; **P < 0·02; ***P < 0·01; n.s., not significant.

^†Indicates outer-wall peristome width.