Enrichment of the Fundamentals for Nature Education in Remote Islands and Places in Okinawa Prefecture VI：Flora of Tsuken-jima Island, Uruma-shi, the Ryukyu Islands

摘要

Vascular flora of a remote island Tsuken-jima, situated 4 km southeast from Yokatsu peninsula of Okinawa Island, was studied to gain a basis for nature education in remote islands. Totally 392 species and five varieties of vascular plants of 97 families were recorded on the island in wild state. Among them the distribution of Balanophora fungosa was mentioned as a floristically noteworthy species in the flora of the island. The percentage of naturalized plants was increased from 22.7 to 35.6 in the last quarter of a century. Our anxious that invasive plants might increase furthermore.