Abstract
The 22 species ofBlumea occurring in India have been investigated for structural variations of style and the pollen presentation mechanisms. The typically gynomonecious capitulum, with several series of female florets on the periphery and fewer bisexual florets in the centre, presents diverse patterns in the structure and behaviour of anthers, styles and stigmas. Thus, the different pollen presentation mechanisms show that inbreeding, outbreeding, or both mechanisms may be operating within a single capitulum. Based on the total number of florets in a capitulum, the species have been grouped into 4 categories.
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