Dormancy and dispersal in dimorphic achenes of tansy ragwort, Senecio jacobaea L. (Compositae)

Abstract

Marginal and central florets of the capitula of tansy ragwort Senecio jacobaea yield different kinds of fruit. The central (“disk”) achenes are lighter (x±SE=199±5μg), more numerous (x±SE=58±0.6 achenes per head), and are equipped with a pappus aiding wind transport and rows of trichomes aiding animal transport. The marginal (“ray”) achenes are heavier (x… (More)
DOI: 10.1007/BF00396754

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