New Record of Gratiola fluviatilis (Plantaginaceae) in Izu Peninsula, Shizuoka Prefecture, as the Easternmost Locality in Japan

Abstract

We discovered a population of Gratiola fluviatilis (Plantaginaceae) in Izu Peninsula, Shizuoka Prefecture, Japan. The species has been rarely found in Mie Prefecture (now extinct) and in regions further east in Japan. The new locality greatly extends the distribution area of the species further eastwards.