. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. 10 BURSA BURSA-PASTORIS AND BURSA HEEGERI I The flowers are adapted to both cross- and self-fertilization, all the evi- dence now at hand indicating- that the latter method is normally by far the more efficient. Leaving- out of account 2 of the 21 original cultures which showed by their constitution that their parents were hybrids, less than 1 per cent of the plants raised from seed collected in nature showed evidence of being the result of cross-fertilization between difEerent biotypes. Crosses
. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. 10 BURSA BURSA-PASTORIS AND BURSA HEEGERI I The flowers are adapted to both cross- and self-fertilization, all the evi- dence now at hand indicating- that the latter method is normally by far the more efficient. Leaving- out of account 2 of the 21 original cultures which showed by their constitution that their parents were hybrids, less than 1 per cent of the plants raised from seed collected in nature showed evidence of being the result of cross-fertilization between difEerent biotypes. Crosses between different flowers of the same plant and between different indi- viduals of the same biotype may take place somewhat more frequently than crosses between the flowers of plants belonging to different biotypes, though nothing in the resultant offspring gives any clue to the frequency of such Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shull, George Harrison, 1874-1954. Washington, Carnegie Institution
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplanthybridization
