Table 3. Chemical Structural Compositional Similarity (CSCS) and Bray–Curtis (BC) similarity within and between congeneric species.

Within-species sample pairs included both jasmonic acid-treated and control and both young and mature leaves for the four focal species (Inga cocleensis, Piper cordulatum, Protium panamense, and Psychotria acuminata). Between-species sample pairs include every leaf of each focal species paired with a young, control leaf of a congeneric species, including 14, 10, 2 and 19 species of Inga, Piper, Protium, and Psychotria, respectively. Significance refers to the proportion of 999 differences in chemical similarity between within-species and between-species sample pairs calculated for permuted datasets that were larger than the observed difference.

Genus	Within	Between	Δ	Significance
(A) CSCS similarity
Inga	0.26	0.17	0.09	0.006
Piper	0.40	0.07	0.32	<0.001
Protium	0.23	0.15	0.08	0.105
Psychotria	0.32	0.15	0.17	<0.001
(B) Bray–Curtis (BC) similarity
Inga	0.18	0.11	0.07	0.004
Piper	0.25	0.03	0.22	<0.001
Protium	0.13	0.07	0.06	0.048
Psychotria	0.19	0.05	0.13	<0.001