Species diversity index (SDI) of streetside tree popuylations in 21 cities and towns. SDI was calculated according to the formula (2).
| City or town | SDI | Original data from |
|---|---|---|
| United Kingdom | ||
| Northamptonshire | 4.4 | (1) |
| Avon County | 4.5 | (1) |
| Churchyards in Gwynedd, Wales | 5.8 | (5) |
| Lambeth Borough, London | 6.0 | (13) |
| Manchester City | 6.9 | (19) |
| District of Arfon,Gwynedd, Wales | 7.3 | (7) |
| Norfolk | 8.4 | (1) |
| Unites States | ||
| Reed Keppler Park trees | 5.0 | (8) |
| Syracuse, NY | 6.5 | (15) |
| New Orleans, LA | 7.6 | (18) |
| Urban Springfield, MA | 9.2 | (4) |
| Prince Georges, MD | 10.0 | (21) |
| 40 towns in Iowa | 11.5 | (20) |
| Urban Amherst, MA | 11.7 | (4) |
| Wicomico, MD | 13.6 | (21) |
| Northwestern University campus, IL | 14.9 | (12) |
| Two Urbana, IL neighborhoods | 15.9 | (3) |
| Anne Arundel, MD | 20.1 | (21) |
| Other countries | ||
| Longyan, Fujian, China | 6.0 | (11) |
| Athens, Greece | 11.4 | (14) |
| Hong Kong | 12.7 | (10) |