water, germination is sufficiently slow enough to maintain viability for several weeks if the moisture content is kept high. These species usually are found in the tropics.
In highly recalcitrant seeds, germination starts immediately and continues very rapidly, even in the absence of additional water. They can withstand very little water loss and, for this reason, these seeds reach the point where water becomes limiting and viability in storage is rapidly lost. Such seeds are shed into tropical forests or wetlands where sufficient water is available for continued germination throughout the year such as for Avicennia marina or Syzygum sp.
As a result, according to the scientific literature, it is suggested that seed species should not be labeled as orthodox or recalcitrant since a relatively wide variation is found in seed behavior with respect to desiccation and low temperature tolerances.