Summary Seed of mouse‐ear ( Pilosella officinarum ) and king devil hawkweed ( P. praealta ) germinated rapidly at warm temperatures without after‐ripening. Germination differences were found which appeared to be related to the preferred habitat of each species. King devil seed was lighter and had lower reserves than mouse‐ear seed. Light induction was required by king devil. The range of sUltable temperatures for rapid germination was wider and the optimum higher for king devil compared to mouse‐ear seed. King devil tolerated more moisture stress during germination than mouse‐ear but was inferior to white clover, alsike, and cocks‐foot seed. The ratio of shoot to root growth was greater in king devil seedlings than in mouse‐ear seedlings. Mouse‐ear had a more limited morphological response to shading than king devil during both seedling and adult life stages. Mouse‐ear preferred higher soil fertility than king devil. Vegetative propagation of mouse‐ear increased with fertilisation. Calcium nitrate increased the number of daughters produced and molybdenum‐fortified superphosphate increased the length of stolons.
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W. Makepeace (1985) studied this question.
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