Phenology of flowering of the evergreen Oriental planes (Platanus orientalis var. cretica) endemic in the island of Crete
2001
Nikolakaki, S.E. | Hajaje, H.M. (University of Crete, Rethymnon (Greece))
Preliminary studies on flowering of the evergreen Platanus orientalis, were based on observations on some of the naturally growing evergreen planes in the island of Crete, on seedlings originated from artificial selfing of evergreen, as well as, on ramets produced from naturally growing evergreen trees. Flowering of the evergreen planes has special morphological and seasonal characteristics: Most of the evergreens flower continually during autumn and winter with a pause of flower production in late June-July; few evergreen planes were found to deviate from this flowering pattern, some producing very few flowers in winter and others being sterile. Partial overlap of evergreen and deciduous flowering takes place in spring. The population of the evergreen planes in Crete, though of limited size since antiquity, continuous to exist and naturally growing evergreen young seedlings, have been discovered. Although there are indications that ecological and seasonal factors, as well as, internal physiological ones, operate as obstacles for the natural reproduction of evergreen planes, it is assumed that, natural hzbridization among evergreens in winter, as well as, natural hybridization among evergreens and deciduous, takes place to the certain extent
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