Abstract
I analyzed within‐ and between‐plant variation in seed weight from one greenhouse and four natural populations of Impatiens capensis Meerb. Most variation in seed size in natural populations occurred within populations and within plants. Weights of seeds from cleistogamous flowers on greenhouse plants increased with height on the plant and proximity to the main stem, a result that may be related to the local supply of photosynthate. Mean seed weight in the natural populations declined during seed set, then increased again. Seeds from chasmogamous flowers were significantly larger in one of the four populations. Maternal parents differed significantly in both mean seed weight and the relative size of the two types of seeds. Combined genetic and general environmental effects accounted for 26% of the total phenotypic variance, which provides an outside estimate of the heritability of this character.
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