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Taxonomy and distribution of Japanese populations of Pyrus ussuriensis Maxim. (Rosaceae)

Taxonomy and distribution of Japanese populations of Pyrus ussuriensis Maxim. (Rosaceae)

Journal of Japanese Botany 78(3): 119-134

Wild and naturalized populations of P. ussuriensis are taxonomically reinvestigated in Japan based on fresh materials and herbarium specimens. The species is newly circumscribed based exclusively on wild forms. It is characterized by having leaves with lamina less than 10 cm long, small fruits less than 3 cm long, excluding the calyx, and persistent calyx on the mature fruit. P. ussuriensis is divided into two varieties: P. ussuriensis var. ussuriensis and P. ussuriensis var. hondoensis.

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