Dichotomous Key

Plants

Dichotomous Key

1A. Leaves needlelike.......... go to 2
1B. Leaves broad with flattened blade.........go to 6
2A. Needles less than2.5 cm long.........Taxus Canadensis
2B. Needles 5 cm or longer.......... go to 3
3A. Needles 5 to 12.5 cm long..........go to 4

3B. Needles more than 12.5 cm long..........go to 5
4A. Needles in clusters of two..........Pinus sylvestris
4B. Needles in clusters of four or five..........Pinus strobus
5A. Needles in clusers of two..........Pinus nigra
5B. Needles in clusters of three..........Pinus ponderosa
6A. Leaves divided into separate leaflets..........go to 7
6B. Leaves in one piece, no leaflets......... go to 8
7A. Leaves with five to seven leaflets, bottom pair smallest.........Carya ovata
7B. Leaves with 13 to 41 leaflets..........Allanthus altissima
8A.Leaf edge smooth............Cornus Flordia
8B.Leaf edge saw-toothed..............Fagus Grandifolia