Abstract
A total 25 population samples and some 700 herbarium specimens belonging to theHypericum pseudopetiolatum complex were morphologically examined for better understanding of taxa within the complex. As a result, it was revealed that three distinct types, which are geographically differentiated, can be recognized within the complex in Japan.The Japan Sea type characterized by more spherical capsules and remarkable glandular sepals occupies the Japan Sea side of the Japan Archipelago. The Sohayaki type is characterized by more slender capsules and no or fewer glandular sepals and is distributed on the Pacific side (so-called Sohayaki region). Distribution ranges of these two types do not overlap except in northern and central Kyushu, where intermediates between them are sporadically detected. The Hakone type characterized by long styles and remarkable black glands on the sepals occurs only in the volcanic area in the Fuji-Hakone-Izu region. This type seems to be closely related to, but clearly differentiated from the Sohayaki type.
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