A Quantitative Study of Inflorescence Development in Phaseolus vulgaris

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Abstract
The paper describes the sequence and pattern of inflorescence differentiation in six determinate and three indeterminate varieties of Phaseolus vulgaris. The terminal inflorescence of determinate varieties is a compound raceme possessing a peduncle bearing triads—branch inflorescences, each consisting of three flower buds developed acropetally on a condensed axis. Irrespective of the number of leaves on the main stem the bud primordium in the axil of the uppermost leaf differentiates into the first triad on the plant. In indeterminate varieties, the first formed triad arises at the lowermost node of the first formed lateral inflorescence, the position of which on the main stem is a varietal characteristic.

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