Crystallization behavior has been studied for a series of recently synthesized liquid crystalline polycarbonates1 based on a methyl-substituted stilbene mesogen and a methylene-containing flexible spacer. The stability of the nematic phase and its relationship to three-dimensional crystallinity were studied. Development of crystallinity was followed by isothermal and nonisothermal crystallization using differential scanning calorimetry (DSC) and polarizing optical microscopy. A monotropic liquid crystal phase is identified for these polycarbonates. The multiple melting endotherms seen in the heating scan are assigned to the melting of crystals forming either from the mesophase (melting at higher temperature) or from the isotropic phase (melting at lower temperature). The number, n, of -(CH2)- units in the flexible spacer affects the transition temperatures seen in the cooling and heating scans. Only a weak odd-even effect is seen in the upper melting of the heating scan from n = 5 to 8. In this range of spacer length, the region of stability of the liquid crystal phase seen in the cooling scan becomes smaller. When the length of the spacer becomes greater than that of the mesogen (n greater-than-or-equal-to 9), all the transition temperatures drop.