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No sex in Polygonum viviparum
Fruit set is virtually absent in this common arctic and alpine perennial. Diggle et al. (pp. 145-156) show that, although malfunctions of male and female gametophyte development are common, these defects are not responsible for the unusually low fruit production. Rather, absence of fruit is due to a low rate of fertilization and to embryo/fruit abortion.
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