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clarkia breweri/papillon-lefevre disease

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Seed set variation in wild Clarkia populations: teasing apart the effects of seasonal resource depletion, pollen quality, and pollen quantity.

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In habitats where resource availability declines during the growing season, selection may favor early-flowering individuals. Under such ephemerally favorable conditions, late-blooming species (and individuals) may be particularly vulnerable to resource limitation of seed production. In California, a

Resource reallocation does not influence estimates of pollen limitation or reproductive assurance in Clarkia xantiana subsp. parviflora (Onagraceae).

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OBJECTIVE Studies of pollen limitation and the reproductive assurance value of selfing are important for examining the process of floral and mating system evolution in flowering plants. Recent meta-analyses have shown that common methods for measuring pollen limitation may often lead to biased
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