. Contributions from the Laboratory of Plant Genetics. 208 THE AMERICAN NATURALIST [Vol. XLV. Fig. 10. Mature plant of a hybrid (10.30 La), grandiflora B x biennis A, Fx generation. Hybkids IN THE Fx GENERATION The cultures of 1910 in the Fl generation were hybrids of three different combinations of parents, as follows: 1. grandiflora B X biennis A (10.30), grown at the Bussey Institution. 2. grandiflora B X biennis B (10.18) and the recip- rocal cross (10.19), grown at the Bussey Institution. 3. grandiflora A X biennis B (10.17) and its recip- rocal cross (10.20), grown at the Botanic Garden
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. Contributions from the Laboratory of Plant Genetics. 208 THE AMERICAN NATURALIST [Vol. XLV. Fig. 10. Mature plant of a hybrid (10.30 La), grandiflora B x biennis A, Fx generation. Hybkids IN THE Fx GENERATION The cultures of 1910 in the Fl generation were hybrids of three different combinations of parents, as follows: 1. grandiflora B X biennis A (10.30), grown at the Bussey Institution. 2. grandiflora B X biennis B (10.18) and the recip- rocal cross (10.19), grown at the Bussey Institution. 3. grandiflora A X biennis B (10.17) and its recip- rocal cross (10.20), grown at the Botanic Garden of Har- vard University. Bearing in mind that the biennis strains A and B are practically indistinguishable and that the grandiflora strains A and B are essentially similar, the cultures as a whole would not be expected to differ markedly, which was the case. The figures of hybrids published with this paper are from two plants in the first culture (grandiflora B X. 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 work.. Bussey Institution. Boston : [s. n. ]