Table 1. Summary of results of tests of intercontinental predictive ability for 10 exemplar species.

Species	Predicted present	Known present	Coincidence	P
Lychnis flos-cuculi L.	1580	83	82	<10−10
Ranunculus sardous Crantz	1615	303	166	0.15
Brassica tournefortii Gouan (Native to Africa)	1855	14	13	0.00072
Carpobrotus edulis (L.) L. Bolus (Native to southern Africa)	1668	20	18	7.1×10−5
Cardamine impatiens L.	1861	29	29	3.4×10−7
Coronopus squamatus (Forssk.) Aschers.	1314	14	9	0.027
Silene conoidea L.	1666	22	16	0.020
Clematis vitalba L.	1868	25	22	0.00044
Clematis orientalis L. (Native to China)	685	15	13	7.5×10−9
Ranunculus ficaria L.	1520	52	48	1.8×10−12

Presented are the number of counties in which the species was predicted potentially present (“Predicted present;” out of 3111), the number of counties of known occurrence (“Known present”) [54], the coincidence between the latter two sets of counties (“Coincidence”), and the probability value associated with this coincidence.