Dichotomous. Forking regularly by pairs.
Dicotyledonous. Having two cotyledons.
Didymous. Twin; found in pairs.
Didynamous (stamens). In two pairs of unequal length.
Diffuse. Widely or loosely spreading.
Digitate. Compound, with the members borne in a whorl at the apex of the support.
Dimerous (flower). Having all the parts in twos.
Dimidiate. In halves, as if one half were wanting.
Dimorphous. Occurring in two forms.
Diœcious. Unisexual, with the two kinds of flowers on separate plants.