AGROBIOLOGIA
Volume 3, Numéro 1, Pages 5-13
2013-01-01
Complex Dispersal Strategyin Picris Cupuligera (asteraceae, Lacidceae)
Authors : Daniel Petit .
Abstract
Picriscupuligera is an annual taxon of Lactuceae from NorthA:frica living mainly in arid. semi-arid and sub-humid areas and with mild winters. We describe three kinds of dispersal: epizoochory of capitules linked to their peduncles, anemochory of free central achenes of capitules, and barochory of peripheral achenes stuck to receptacle and involucral bracts. The proportion of each kind depends on the habitat, as zoochory is more important in open than in woodl and habitat. Anemochory is the earliest mode of dispersal as it happens as soon as the involucral bracts are dried out. Barochory occurs more progressively and last peripheral achenes are released independentlyuntil January.
Keywords
Zoochory, anemochory, barochory, bioclimatology,heterocarpy
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