Dichotomous key

A.Plant One: B. Needles with flat cross section–slightly rounded at the tip, green in colour–some brown spots. B1. Branchlets glabrous; cones. B2. Thick, cylindrical bole (trunk)–aereal stem of plant.  B3. Perennial plant. A. Plant Two: C. Flower white in colour. C1. Rootstock stout; drooping. C2. Compound plants. C3. Nodes and …