Each species was recorded using a four-letter code. These codes, used in the raw data, are the first two letters of the genus and the first two letters of the species (for example, Fagus grandifolia=FAGR)
# indicates exotic species
* indicates not found in 1991
** indicates not found in 1999
| ACRU | Acer rubrum | Red maple |
| ACSA | Acer saccharum | Sugar maple |
| ACSP** | Acer sp. | Maple (species) |
| AIAL# | Ailanthus altissima | Ailanthus |
| AMSP** | Amelanchier sp. | Serviceberry |
| BELE | Betula lenta | Black birch |
| CACA** | Carpinus caroliniana | American hornbeam |
| CACO* | Carya cordiformis | Bitternut hickory |
| CAGL* | Carya glabra | Pignut hickory |
| CAOV | Carya ovata | Shagbark hickory |
| CATO* | Carya tomentosa | Mockernut hickory |
| CASP** | Carya sp. | Hickory (species) |
| CEOC | Celtis occidentalis | Hackberry |
| COFL | Cornus florida | Flowering dogwood |
| ELAN* # | Elaegnus angustifolia | Russian olive |
| EUAL* # | Euonymous alata | Burningbush |
| FAGR | Fagus grandifolia | American beech |
| FRAM | Fraxinus americana | White ash |
| HAVI | Hamamelis virginiana | Witch-hazel |
| OSVI | Ostyra virginiana | Eastern hophornbeam |
| PAQU* | Parthenocissus quinquefolia | Virginia creeper |
| PIST* | Pinus strobus | Eastern white pine |
| PRAV# | Prunus avium | Sweet cherry |
| PRSE | Prunus serotina | Black cherry |
| QUAL | Quercus alba | White oak |
| QUPR | Quercus prinus | Chestnut oak |
| QURU | Quercus rubra | Northern red oak |
| QUVE | Quercus velutina | Black oak |
| QUSP** | Quercus sp. | Oak (species) |
| RHTY** | Rhus typhina | Staghorn sumac |
| ROPS | Robinia pseudoacacia | Black locust |
| SAAL | Sassafras albidum | Sassafras |
| TIAM | Tilia americana | American basswood |
| ULAM | Ulmus americana | American elm |
| ULRU | Ulmus rubra | Slippery elm |
| VISP | Vitis sp. | Grape (species) |
Species were also coded by number to facilitate computer
analyses with Basic (not all species were found on our site):
| American beech | 1 |
| Black birch | 2 |
| Black cherry | 3 |
| American elm | 4 |
| Flowering dogwood | 5 |
| Hackberry | 6 |
| Hickory, mockernut | 7 |
| Hickory, pignut | 8 |
| Hickory, shagbark | 9 |
| Oak, black | 10 |
| Oak, chestnut | 11 |
| Oak, red | 12 |
| Oak, scarlet | 13 |
| Oak, white | 14 |
| Pin cherry | 15 |
| Privet | 16 |
| Prunus sp. | 17 |
| (none) | 18 |
| Eastern redcedar | 19 |
| Red maple | 20 |
| Sugar maple | 21 |
| Witch-hazel | 22 |
| White ash | 23 |
| Eastern Hophornbeam | 24 |
| Unknown | 25 |
| Hickory sp. | 26 |
| Basswood | 27 |
| Eastern hemlock | 28 |
| Russian olive | 29 |
| Birch sp. | 30 |
| Sassafras | 31 |
| Staghorn Sumac | 32 |
| Slippery elm | 33 |
| Black Locust | 34 |
| Ailanthus altissima | 35 |
| Maple sp. | 36 |
| American hornbeam | 37 |
| Oak sp. | 38 |
| Staghorn sumac (repeat) | 39 |
| Hackberry (repeat) | 40 |
| Vitis sp. | 41 |
| Sweet cherry | 42 |
| Serviceberry sp. | 43 |