Geographical Distribution Patterns of the Apiaceae in Sakhalin and the Kuril lslands

概要

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Thirty species of the Apiaceae in Sakhalin (S) and the Kuril Islands (K) were examined on 1,592 specimens deposited in the main Japanese herbaria: KYO, SAPS, SAPT, TI and TNS. The geographical distribution of 27 of these 30 species was determined quantitatively. Ligusticum scoticum (number of specimens: S+K = 190) and Tilingia ajanensis (S+K = 171) represent the two most abundant species of the Apiaceae in these regions. The Sakhalin-Kurils index (S-K index: S-K/S+K) of L. scoticum showed a somewhat negative numerical value, -0.11, and that of T. ajanensis showed an especially negative value, -0.43, meaning a clear distribution bias of the latter species toward the Kurils. However, many Apiaceae species are characterized by positive S-K indices, which means generally a distribution bias toward Sakhalin. An extreme high positive S-K index (+1.00), which means the presence in Sakhalin but the absence in the Kurils, is found in the following six species: Angelica edulis (but only S+K = 1), A. maximowiczii, A. saxatilis, A. ursina (but actually present in Kunashir), Phlojodicarpus villosus and Sphallerocarpus gracilis. An extreme high negative S-K index (-1.00) is found in only one species, Conioselinum filicinum.