The Effect of External Conditions upon the After-Ripening of the Seeds of Crataegus mollis

@article{DavisTheEO,
  title={The Effect of External Conditions upon the After-Ripening of the Seeds of Crataegus mollis},
  author={Wilmer E. Davis and R. Catlin Rose},
  journal={Botanical Gazette},
  volume={54},
  pages={49 - 62}
}
It is well known that the seeds of many plants do not germinate immediately after ripening, but only after a period of rest which in some cases no doubt extends into years. NOBBE and HANLEIN (i6), for example, kept certain weed seeds under germinating conditions for a period of II73 days without germination. While various workers have done much in the way of adding to the list of seeds that require a rest period before germination, little has been done to determine the real cause of this delay… 
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Food is stored in the embryo in the form of fatty oil; there is also considerable lecithin; neither starch nor sugar is present. The reaction of the cotyledons is acid, but the hypocotyl is slightly
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References

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TLDR
In nature growth of the delayed seeds comes about through the disintegration of the seed coat structures by a longer or shorter exposure to germinative conditions, and the length of the delay depends upon the persistence of the structure securing it.
Longevity of Seeds
TLDR
EWART finds the resistance in Adansonia digitata to be due to the impermeable nature of all layers of the integument, and I find the same to be true of the hard seed of Axyris amaranthoides.
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