Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Euphorbia oblongata (Euphorbiaceae), naturalized in several localities in Japan.

Abstract

Euphorbia oblongata Griseb . (Euphorbiaceae), "Barukan-nourushi" in Japanese, was reported in 2018 as a new naturalized plant from urban areas of Kanagawa Pref., Kanto District, Japan. The species is native to South Europe and West Asia and is naturalized in UK, USA and Australia, etc. In Japan, we confirmed the species from Ibaraki, Tokyo, Aichi, Wakayama and Okayama Prefs. as well as Kanagawa Pref. based on morphological observation and DNA identification. It also grows unintentionally in Kochi Prefectural Makino Botanical Garden and Okayama Handayama Botanical Garden. It is thought that the plant escaped from the cultivation at a home garden and naturalized, but the naturalized area is still limited at present.