Table 1.
Species richness estimates for the tropics and the three main tropical subregions
| Region | Species observed | Stems observed | Unidentified stems, % | Fisher’s alpha minimum | Fisher’s alpha maximum | Stems estimated | Species minimum | Species maximum |
| Africa | 1,376 | 117,902 | 8.4 | 218.7 | 286.6 | 3.4 × 1011 | 4,626 | 5,984 |
| America | 4,375 | 116,754 | 13.5 | 897.2 | 1,203.4 | 8.9 × 1011 | 18,589 | 24,580 |
| Indo-Pacific | 5,672 | 422,974 | 9.6 | 925.8 | 1,225.2 | 7.7 × 1011 | 19,014 | 24,819 |
| Pantropical | 11,371 | 657,630 | 10.1 | 1953.0 | 2,607.7 | 2.0 × 1012 | 40,517 | 53,345 |
Observed values represent the numbers in the original dataset. Unidentified stems were excluded from estimation of minimum Fisher’s alpha, but used to calculate maximum Fisher’s alpha. Estimated stems represent the number of stems predicted to occur within 500 km of each of the 207 sample locations.