Abstract
Abstract Plants of the Cupressaceae family are relatively uncommon in Piedmont: among the spontaneous family entities Juniperus dominates, while Thuja and Chamaecyparis Iawsoniana prevail in Turin for ornamental use. The palynological component is low but constantly present for long periods in the late winter-early spring. Data on airborne pollen grains (Hirst spore-trap) do not usually separate Cupressaceae from Taxaceae and Taxodiaceae because of the close similarity of grains in the fresh samples. Data on the period of presence of the pollen of these families in Turin are given and compared with the ones collected in twelve Italian stations. The allergenic importance of Cupressaceae has been demonstrated in other Italian regions with different biogeographical conditions. In Turin of 1343 patients suffering of pollinosis (observed from February 1st to November 30th 1989) 15 were positive to Cupressus sempervirens and, among them, 4 presented monosensitization and 11 showed multiple reactions (10 to Gramineae and 1 to Betulaceae).
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