Abstract
Previous studies of potence for a small number of metrical traits in Papaver dubium suggested that juvenile characters exhibited potence in the direction of rapid development, implying a past history of natural selection for rapid development in the populations studied. In order to check this conclusion, 32 inbred lines were used in an augmented biparental crossing design and 17 characters, of which 12 reflect rate of development, were scored on the progenies. Results confirmed earlier ideas with respect to juvenile characters and flowering time; selection appears to have been for rapid development, but with the optimum not at the extreme of the range. Capsule number and flower diameter also showed substantial potence in the positive direction, but in three other adult characters, potence showed no consistent directional tendencies, suggesting that any selection on these has been of the stabilising type.
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