Table 1.

χ² statistics from logistic regression testing for differences in survival

Independent variables		Dependent variable
	df	Survival (χ2)
(a) Across populations
Population	2	24.46***
n	250
(b) Across maternal families
L. tridentata: high latitude
Tmin	1	0.01
Maternal family	9	0.01
n	100
L. divaricata: high latitude
Tmin	1	17.07***
Maternal family	9	3.70
n	150
L. divaricata: low latitude
Tmin	1	19.26***
Maternal family	9	17.70*
n	150

(a) Across the three populations, high latitude L. tridentata and high and low latitude L. divaricata, following a single freeze of −10°C. (b) Across maternal families of all three populations

^*P < 0.05;

^***P < 0.0001