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I too often find seed still in the bottom of some capsules after nearly a year - they only get sown when the capsule eventually disintegrates.They have not evloved the best dispersal method.
Rob: Surely any dispersal method which keeps viable seed close to the parent plant for more than a year before releasing it has some point to it.
Of course; it is just not the BEST method, if, by dispersal, you imply spreading the seed as widely as possible.
Delaying the release (better than dispersal?) of viable seed suggests something like a safeguard against unfavourable conditions in the 'gap' year, for example.