Ilex opaca American Holly Aquifoliaceae
| FIA distributions (504 counties) quartiles: | min | 1st | mean | median | 3rd | max | rank |
| Diameter, cm (3241 plots) | 0.3 | 3.4 | 7.3 | 5.1 | 8.6 | 54.6 | 73 |
| Growth Rate, cm2/yr (398 plots) | 0.1 | 1.8 | 6.1 | 4.4 | 8.4 | 53.2 | 76 |
| Annual Temperature, °C | 4.8 | 14.2 | 16.0 | 16.5 | 18.0 | 20.7 | 14 |
| January Temperature, °C | -6.2 | 3.1 | 5.6 | 5.9 | 8.2 | 13.4 | 10 |
| Precipitation, mm | 959 | 1160 | 1280 | 1260 | 1380 | 1930 | 15 |
| Potential Evapotranspiration, mm/month | 24.0 | 65.3 | 72.1 | 74.1 | 80.1 | 107.0 | 17 |
| Maximum Elevation, m | 5 | 77 | 272 | 152 | 255 | 1950 | 71 |
| Slope, percent | 0.6 | 2.4 | 8.9 | 5.9 | 10.5 | 49.8 | 62 |
| pH | 2.1 | 4.1 | 4.4 | 4.5 | 4.8 | 7.0 | 58 |
| Permeability, cm/hr | 0.3 | 1.4 | 3.1 | 2.3 | 4.3 | 11.0 | 21 |
| Organic Matter, percent | 0.8 | 1.3 | 2.9 | 1.8 | 2.8 | 46.2 | 68 |
| Clay, percent | 4.1 | 18.5 | 22.1 | 22.2 | 26.8 | 43.9 | 58 |
| Water-Holding Capacity, cm/cm | 4.1 | 6.3 | 7.2 | 6.9 | 7.9 | 12.0 | 53 |