. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa bursa-pastoris; Bursa heegeri; Plant hybridization. 48 BURSA BURSA-PASTORIS AND BURSA HEEGERI : : This typical specimen of Bursa heegeri^zs, castrated and polli- nated with pollen from a specimen of B. bp. simplex which differed from the usual condition of that biotype in having the apex of the leaves taper- ing- and acutish. This condition has been shown to be merely a fluctua- tion (see p. 26), so that the plant used in this cross is to be considered a. Fig. 23.—Bursa bursa-pastoris simplex X heegeri, Fp Incomplete d
. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa bursa-pastoris; Bursa heegeri; Plant hybridization. 48 BURSA BURSA-PASTORIS AND BURSA HEEGERI : : This typical specimen of Bursa heegeri^zs, castrated and polli- nated with pollen from a specimen of B. bp. simplex which differed from the usual condition of that biotype in having the apex of the leaves taper- ing- and acutish. This condition has been shown to be merely a fluctua- tion (see p. 26), so that the plant used in this cross is to be considered a. Fig. 23.—Bursa bursa-pastoris simplex X heegeri, Fp Incomplete domi- nance of the heteris characteristics produces a form resembling B. bp. rhomboidea, but mostly with longer, sharper primary lobes. typical specimen of B. bp. simplex. The pollen-parent of this family was a sib of the pistil-parent of the family last described, and the two speci- mens of B. heegeri involved in these two families were likewise sibs, so that these two crosses were essentially reciprocal. The seeds were sown April 25, 1906, and produced 23 offspring, which were intermediate be- tween B. bp. heteris and B. bp. rhomboidea as to the rosette characters, and in which they were indistinguishable from the reciprocal hybrid family,. 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, D. C. , Carnegie Institution of Washington
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