Plant Material. Cloned plants of a hybrid Tradescantia (02 clone; putative parents T. occidentalis x T. ohiensis; obtained from L. Mericle, Dept. of Botany and Plant Pathology, M.S.U.) were planted in plastic pots in a 1:1:1 (v/v) mixture of potting soil, sand, and Perlite. The plants were watered twice daily and maintained under a daily regime of 16-hr light at 24 C and 8-hr dark at 20 C. The light intensity at plant height was 4 to 6 x 104 ergs cm-2 sec-1, and the RH was maintained between 60 and 70%. Throughout this paper the following terminology will be used when referring to the plant material: day -2: flowers or flower parts isolated 2 days prior to flower opening; day -1: flowers or flower parts isolated 1 day prior to flower opening; and day 0: flowers or flower parts isolated on the day of opening.