TABLE 3.

Pearson correlations and phylogenetically independent contrast (PIC) correlations for relationships between water-related traits with floral longevity in slipper orchids.

	Correlation with floral longevity		PIC
Variables	r2	P-value	r2	P-value
Floral stem
Epidermal thickness	0.526	0.001	0.520	0.0011
Exodermal thickness	0.166	0.116	0.153	0.120
Endodermis thickness	0.819	<0.001	0.825	<0.001
Petal
Upper epidermal thickness	0.378	0.007	0.372	0.009
Lower epidermal thickness	0.382	0.006	0.401	0.006
Mesophyll thickness	0.144	0.121	0.226	0.054
Petal thickness	0.247	0.036	0.322	0.017
Vein density	0.312	0.016	0.249	0.042
Lip
Upper epidermal thickness	0.234	0.042	0.249	0.041
Lower epidermal thickness	0.242	0.038	0.217	0.040
Mesophyll thickness	0.042	0.411	0.004	0.799
Lip thickness	0.094	0.214	0.037	0.457
Vein density	0.457	0.002	0.515	0.001
Dorsal sepal
Upper epidermal thickness	0.415	0.004	0.438	0.004
Lower epidermal thickness	0.454	0.002	0.565	<0.001
Mesophyll thickness	0.060	0.327	0.129	0.158
Dorsal sepal thickness	0.161	0.099	0.263	0.035
Vein density	0.484	0.001	0.438	0.004
Stomatal density	0.491	0.001	0.717	<0.001
Synsepal
Upper epidermal thickness	0.551	<0.001	0.556	<0.001
Lower epidermal thickness	0.635	<0.001	0.659	<0.001
Mesophyll thickness	0.005	0.787	0.073	0.295
Synsepal thickness	0.342	0.011	0.370	0.010
Vein density	0.506	0.001	0.536	<0.001
Stomatal density	0.610	<0.001	0.612	<0.001