A particular aromatic polyesteramide with flexible spacers has been shown to crystallize into a variety of spherulitic forms whose birefringence varies markedly with crystallization temperature. However, a temperature step crystallization technique allows the unambiguous recognition of the different forms in spite of the varying birefringence. Though their appearance under optical and electron microscopy is different, all observed crystalline forms show very similar X-ray diffraction patterns, which suggests that they share a common local molecular arrangement. Each form has a characteristic melting point which is almost invariant with crystallization temperature. From this it is suggested that the various forms comprise chainfolded crystals containing different integral lengths of the same rather long monomeric unit. No liquid crystalline phases were observed in this material.