Table 1.

Geographical and niche attributes among sister–sister pairs and sister–non-sister congener pairs. (Ecological and reproductive shifts were scored as 0 for ‘no shift’, 0.5 for ‘partial shift’ and 1.0 for ‘shift present’. Morphological trait contrasts were calculated as |log(X_A) − log(X_B)|, where X is the trait value of species A and B in a sister pair. Climate divergence is 1 − Schoener's D, estimated based on climatic niche models predictions. ***p < 0.001; **p < 0.01; *p < 0.05.)

attribute	sister–sister pair	sister–non-sister congener pair	p-valuesa
proportion sympatric	0.80	0.57	***
range overlap	0.26	0.13	***
log(range asymmetry)	1.27	1.74	***
habitat shift	0.54	0.70	**
soil shift	0.55	0.74	**
growth form shift	0.03	0.12	**
altitude shift	0.20	0.26	*
plant height contrast	0.53	0.73	**
climate divergence	0.62	0.75	***
flowering time shift	0.20	0.28	*
flower size contrast	0.41	0.56	**
chromosome count shift	0.15	0.29	**

^ap-values corrected for multiple comparisons.