Table 2.
Summary of variables used for the statistical analyses.
| Island archipelago | |||||
|---|---|---|---|---|---|
| Variable | New Zealand | Canary Islands | Hawaiian Islands | Juan Fernández | All islands |
| No. of lineages | 98 | 23 | 23 | 6 | 150 |
| Number of monophyletic island lineages | 33 | 13 | 18 | 3 | 67 |
| Number of lineages with different ploidy level than closest sister outside of island | 8 | 2 | 6 | 2 | 18 |
| Mean (SD) number of island endemic species per lineage | 11.3 (17.6) | 13.7 (15.0) | 16.4 (19.0) | 4.5 (3.7) | 12.2 (17.1) |
| Mean (SD) stem age per lineage in millions of years | 15.63 (17.30) | 8.48 (6.19) | 9.21 (6.23) | 5.93 (5.86) | 13.16 (14.81) |
| Mean (SD) number of ploidy levels per lineage | 1.7 (1.2) | 1.5 (0.7) | 1.2 (0.4) | 1.0 (0.0) | 1.6 (1.1) |
| Mean (SD) % of endemic island species with chromosome counts | 86.0 (22.8) | 74.3 (24.0) | 50.9 (31.9) | 71.8 (36.1) | 78.2 (27.8) |
| Median number of species in lineage outside of island system | 34 | 77 | 58 | 384 | 51 |
Means and standard deviations (SD) were calculated for each non-count variable. The data set included the subset of 150 lineages of native vascular plants with the following criteria: dated phylogeny available, at least one native species sampled in the phylogeny, at least two native species on the island system, and at least one known chromosome count from the island system.