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

Takahashi, Hideki

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.

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

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