Reception of photoperiodic stimuli and control of flowering of ‘Oregon 2065’ bush bean (Phaseolus vulgaris L.) by the primary and first trifoliate leaves was studied. One or both of these leaves were given short days (9 hr, SD) or long days (9 hr + 7 hr photoperiod extension, LD). All other leaves were removed. Plants flowered if either primary or trifoliate leaves received SD. The SD or LD treatment to a particular leaf had its greatest effect on flowering at the node of that leaf. Inflorescences with flower buds larger than 2.5 mm developed at primary and at first trifoliate nodes if either set of leaves received SD, but, if one received LD, bud abscission occurred before anthesis at the node of the LD leaf.