Seed germination traits of Triadica sebifera seeds collected from introduced (USA, black) and native (China, white) ranges. (a) Day of first germination, (b) days to 50% of total germination, (c) germination rate. Seed sources, collection times and number of replicates are given in Supplementary Tables S1 and S2. Means + 1 SE are shown. Differences between origins were determined by nested ANOVAs with origin as fixed effect and populations as random effect nested within each origin.