The growth rate data reported by Bassett and collaborators (Sutton, S. J.; Vaughan, A. S.; Bassett, D. C. Polymer 1996, 37, 5735) for the 12-alkane C246H494 have been analyzed using nucleation theory pertinent to chain molecules of low molecular weight. The same value for the interfacial free energy governing nucleation was found irrespective of whether the mature crystallites that developed were chains folded, with a spherulitic superstructure (low-temperature crystallization), or were non-spherulitic with extended chain (high-temperature crystallization). Reasons for this behavior are advanced and the important implications to polymer crystallization discussed.