Seed Production of Stylosanthes humilis as Influenced by Origin and Temperature During Flowering1

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Abstract
Ten selections of the tropical annual pasture legume Stylosanthes humilis, grown in controlled‐environment cabinets, were induced to flower at a common time and then subjected for 60 days to 31/24, 24/17, or 17/10C, day/night temperatures. Mature seed were not formed on inflorescences differentiated at 17/10C. This regime also decreased inflorescence number and floret number. Seed production at 31/24 and 24/17C was similar, but selections differed in their response to temperature and in the pathways through which response was reflected. The cultivar ‘Lawson’ and a selection from Dayboro, Queensland, were superior. Ecological implications are considered.

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