Table 4. Pairs of trait with a latitudinal gradient of co-variation.

	Primary dormancy	Secondary dormancy	Vegetative growth rate	Flowering time
Primary dormancy		-	3%	7%
Secondary dormancy	0.267		-	-
Vegetative growth rate	0.032	0.111		6%
Flowering time	<0.0001	0.441	0.005

Significance was tested with a linear regression model, with latitude as a dependent variable (see methods). p-values associated to the interaction between the traits and the percentage of the latitudinal variation explained by the interaction are shown below and above the diagonal, respectively.