Table 3.

Previous studies on the relationship between genome size and precipitation

Correlation	Level	Description	Authors
+	Sp.	5 Microseris bigelovii and 5 M. laciniata	Castro-Jimenez et al., 1989
+	Sp.	4 Crambe and 3 Sonchus in Micronesia	Suda et al., 2003
+a	Pop.	24 Microseris douglasii	Price et al., 1981
+	Sp.	401 California angiosperms	Knight and Ackerly, 2002
−	Sp.	8 Argyranthemum, 4 Silene and 5 Micromeria in Micronesia	Suda et al., 2003
−b	Sp.	18 North American Pinus	Wakamiya et al., 1993
−c	Pop.	24 Berberis in Patagonia	Bottini et al., 2000
ns	Sp.	19 Helianthus	Sims and Price, 1985

Correlations are either +, −, not significant (ns). Studies were classified into different levels: those dealing with different populations of the same species (Pop.) or multiple species (Sp.).

^aTemporal variation within a single population

^blowest mean monthly precipitation

^cannual rainfall, but there was a positive correlation with water availability (no statistical analyses shown).