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Summary
The evolution of the wood ring in arbutus andrachnoides link, in florence (from July 1946 to June 1947).
The anatomical characters of the wood ring of the stem and of the young branch of Arbutus andrachnoides Link have been studied in Florence.
The results are the following: the cambial tissue in the stem starts dividing at the end of April and continues during the summer months, ending completely in September.
In the branch the cambium differentiates almost a month earlier, namely at the beginning of April.
In both cases the only wood ring produced is completed at the end of September. Comparing the evolution of this wood with the climatic factors it can be seen that the cambium activity starts in a period of remarkable rainfall and of regular increase of temperature and presents a remarkable activity still at the end of August.
Arbutus andrachnoides Link. is a spontaneous hybrid between A. Unedo and A. Andrachne and its distribution (in Greece and in the gréek islands) shows that A. Unedo and A. Andrachne had the possibility to overlap in this area and to produce this hybrid.