. Studies in Juglans . regia and J. nigra, in Mem. Acad. Imp. Sci. St. Peters-bourg, 31, pp. 1-59, 1913. Also noted in Bot. Gaz., vol. 57, no. 2, p. 162,1914. is This is the 5th condition of Gregoires hypothesis for explainingchromosome numbers in (Enothera as set forth by Lutz (cf. 14, p. 426). i* Lutz, Anne M., Triploid Mutants in Oenothera, in Biolog. Central.,bd. 32, no. 7, 1912. 15 Berry, Edw. W., Notes on the Geological History of the Walnuts andHickories, Plant World, vol. 15, no. 10, 1912. 10 Collins, G. N., Nature of Mendelian Units, Jour. Heredity, vol. 5,no. 10, 1914. 17 Pierce, N.
. Studies in Juglans . regia and J. nigra, in Mem. Acad. Imp. Sci. St. Peters-bourg, 31, pp. 1-59, 1913. Also noted in Bot. Gaz., vol. 57, no. 2, p. 162,1914. is This is the 5th condition of Gregoires hypothesis for explainingchromosome numbers in (Enothera as set forth by Lutz (cf. 14, p. 426). i* Lutz, Anne M., Triploid Mutants in Oenothera, in Biolog. Central.,bd. 32, no. 7, 1912. 15 Berry, Edw. W., Notes on the Geological History of the Walnuts andHickories, Plant World, vol. 15, no. 10, 1912. 10 Collins, G. N., Nature of Mendelian Units, Jour. Heredity, vol. 5,no. 10, 1914. 17 Pierce, N. B., A New Walnut, Science, n. s., vol. 37, no. 955, p. 613,1913. PLATE 13 Juglans californica X Quercus agrifolia Fig. 1.—a, leaf and fruits from F seedling No. 1.—b, leaf and fruits from F seedling No. 1.—e, leaf and fruits from F seedling No. 13c. The nuts from which these three F seedlings grew were borne in thesame cluster on J. californica tree I of 1908 hybridization %. [58]. > 0CICD >CO o CO n on PLATE 14 Juglans californica X Quercus agrifolia Fig. 2—a, leaf and fruits from F! seedling No. 23a. Fig. 2—b, leaf and fruits from F, seedling No. 23b. Fig. 2—c, leaf and fruits from F, seedling No. 23c. The nuts from which these three F, seedlings grew were borne in thesame cluster on J. californica tree II of 1908 hybridization experiments. X y3. [60]
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