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Abstract
«Pinus mugo» Turra and «Pinus uncinata» Miller in Piedmont. Critical notes and distribution. — The Authors have carried on a research on the distribution of Pinus mugo Turra (sensu Fl. Eur.) and Pinus uncinata Miller in all Piedmont Alpes and, having observed the extreme variability of the characters which are employed in the keys of determination to differentiate these two species, they suggest other and more constant characters. These are:
They have also considered the istological features, which are found to show complete and gradual transition from Pinus sylvestris L. to Pinus uncinata and to Pinus mugo. As these species show a great tendency to hybridate, the authors suggest the hypothesis that Pinus uncinata, with western area, may be an ancient hybrid between Pinus sylvestris and Pinus mugo, with eastern area. In suppor of this hypothesis, as well as the gradual transition of leaf characters, they can take ecological and palinological data.