Hypericum iwatelittorale

Hypericum iwatelittorale, originally styled Hypericum iwate-littorale, is a species of flowering plant of the St John's wort family (Hypericaceae). Named for its habitat in the coastal regions of the Iwate Prefecture in Japan, the species is a small perennial herb with many small star-shaped flowers of bright yellow petals. It grows upright, with oval to elliptical leaves that are papery in texture and have an array of glands. Each flower has dozens of stamens, and the seeds are dark brown.

Described in 1937 by Japanese botanist Hideo Koidzumi, Hypericum iwatelittorale has at times been considered a synonym of H. pseudopetiolatum. However, it was accepted as a valid species in 2003 by English botanist Norman Robson. Robson placed the species into the type section of Hypericum, and noted its similarities to H. tosaense. While several conservation surveys have included the species, each classified it as data deficient and gave no assessment as to its status.