Hypericum japonicum, also known as matted St. John's-wort or Japanese St. John's wort, is an annual herbaceous flowering plant in the St. John's wort family Hypericaceae, section Trigynobrathys.
H. japonicum is unusually small for a St. John's wort, growing only 2–5 cm (0.79–1.97 in) tall. Its stems are green and 4-angled, with 2–52 mm (0.079–2.047 in) long internodes that usually exceed the leaves. The leaves are sessile and spreading and are persistent. The species is 30-flowered with flowers branching ...
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* Tota la informació es basa en investigacions científiques publicades