- Bulletin of the National Science Museum. Series B, Botany (ISSN:03852431)
- vol.31, no.2, pp.63-65, 2005-06
Swertia japonica (Schult.) Makino var. latifolia Konta is a new variety characterized by broader leaves than those of typical variety of Swertiajaponica (Schult.) Makino. This variety was discovered in Mt. Mihara-yama in Hachijo Island, Tokyo, Japan. Several specimens cited in this paper suggest that this variety is distributed in the Izu Islands as well as Honshu, mainland of Japan.