. Studies in Juglans . o> C CD 3> c< XIC/) o PLATE 19 Juglans californica Watson Fig. 7.—Specimen of polyembryony from cluster No. 208 on ,/. cali-fornica tree No. 16 in Garden Grove, Calif. X _•• Juglans californica var. quercina Babcock Fig. 8.—Specimen of polyembryony from a cluster of abnormal nutson J. californica tree No. 16 in Garden Grove, Calif. X •_>. [70] UNIV. CALIF. PUBL. AGR. SCI, VOL. 2 [BABCOCK] PLATE 19. UNIVERSITY OF CALIFORNIA PUBLICATIONS IN AGRICULTURAL SCIENCES Vol. 2, No. 3, pp. 71-80, plates 20-21 September 20, 1916 STUDIES IN JUGLANS, III (1) FURTHER EVIDEN
. Studies in Juglans . o> C CD 3> c< XIC/) o PLATE 19 Juglans californica Watson Fig. 7.—Specimen of polyembryony from cluster No. 208 on ,/. cali-fornica tree No. 16 in Garden Grove, Calif. X _•• Juglans californica var. quercina Babcock Fig. 8.—Specimen of polyembryony from a cluster of abnormal nutson J. californica tree No. 16 in Garden Grove, Calif. X •_>. [70] UNIV. CALIF. PUBL. AGR. SCI, VOL. 2 [BABCOCK] PLATE 19. UNIVERSITY OF CALIFORNIA PUBLICATIONS IN AGRICULTURAL SCIENCES Vol. 2, No. 3, pp. 71-80, plates 20-21 September 20, 1916 STUDIES IN JUGLANS, III (1) FURTHER EVIDENCE THAT THE OAK-LIKEWALNUT ORIGINATES BY MUTATION BY EENEST B. BABCOCK In previous studies1 the conclusion was reached that the oak-like walnut, Juglans califomica var. quercina Babcock, was firstproduced as a result of germinal variation in a tree of thesouthern California black walnut, J. califomica Wats., and thatthe several recurrences of this peculiar walnut resulted fromrepetitions of the same mutation. It is the purpose of thispaper to report further evidence showing that this conclusionwas correct at least as regards the origin of the first quercinaindividual, although this same evidence may lead to a differentexplanation of some of the recurrences of this form. This evidence consists of the results from hybridizing quercinaand califomica. In 1908 pollen from the original, fertile, typeindividual of quercina was appl
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