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Breeding Systems


[FMP-field: image]

Heterostyly — The flower on the left is a thrum, the one on the right is a pin

  • Pin plants always set more seed, perhaps because the stigmas are exposed.
  • Heterostyly is less efficient than other types of self-incompatibility because each plant can only fertilize half the population.

Photo by K. R. Robertson of plants from Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois.

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