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6. FERNALD, M. L. Gray's Manual of Botany. 8th ed. P. 1473. American Book Co., New York. 1950. 7. GALSTON, A. W. The effect of 2,3,5-triiodobenzoic acid on the growth and flowering of soybeans. Amer. Jour. Bot. 34: 356-360. 1947. 8. HAMNER, K. C. and BONNER, J. Photoperiodism in lelation to hormones as factors in floral initiation and development. Bot. Gaz. 100: 388-431. 1938. 9. HEMBERG, T. Studies of auxins and growth-inhibiting substances in the potato tuber and their significance with regard to its rest-period. Acta Horti Bergiani 14: 134-220. 1947. 10. KHUDAIRI, A. K. Physiological and biochemical studies on flower initiation. Doctoral thesis, University of California, Los Angeles. 1953. 11. KHUDAIRI, A. K. and HAMNER, K. C. The relative sensitivity of Xanthium leaves of different ages to photoperiodic induction. Plant Physiol. 29: 251257. 1954. 12. LEOPOLD, A. C. and THIMANN, K. V. The effect of auxin on flower initiation. Amer. Jour. Bot. 36: 342-347. 1949. 13. MICHENER, H. D. Dormancy and apical domiiinancc in potato tubers. Amer. Jour. Bot. 29: 558-568. 1942. 14. ROBERTS, R. H. A naturally occurr'ing antiauxin. Science 117: 456-457. 1953. 15. STRYDOM, J. C. The effects of ethylenie chlorohydrin on tle rest perio(i an(l auxin content of gladiolus cornis. Doctoral thesis, University of California, Los Angeles. 1950. 16. V.AN OVERBEEK, J. and CKUZADo, H. J. Flower formiiation in the pineapple plant by geotropic stimulation. Amer. Jour. Bot. 35: 410-412. 1948. 17a. VAN OVERBEEK, J., VAZQUEZ, E. S., and GORDON, S. A. Free and bound auxin in the vegetative pineapple plant. Amer. Jour. Bot. 34: 266-270. 1947. 18. VAN SENDEN, HELENE. Untersuchungen jiber den Einfluss v-on Heteroatuxin und anderen Faktoren auf die Bliitenbildung bei der Kurztagspflanze Kalanchoe Blossfeldiana. Biol. Zentr. 70: 537-565. 1951. 19. WENT, F. W. and THIMANN, K. V. Ph1ytohoImnones. Pp. 1-294. Macmillan Co., New York. 1937.

The Flowering of Sunflower Explants in Aseptic Culture