Triadenum japonicum, also known as marsh St. John's wort, is a perennial herb that is native to Japan, Korea, China, and eastern Russia. It is also naturalized in a few other countries, including Australia.
Triadenum japonicum leaves are opposite, lanceolate to ovate-oblong, and gland-dotted. They are 2–8 cm long and 1–1.7 cm wide. The margins of the leaves are revolute (rolled backwards), and the apex is obtuse to emarginate (notched). The base of the leaves is shallowly cordate-amplexicaul (heart-shaped and hugging the stem).
Triadenum japonicum leaves are a deep green color during the summer months. In the fall, the leaves turn a brilliant red color. This makes Triadenum japonicum a popular ornamental plant in many parts of the world.
In addition to their ornamental value, Triadenum japonicum leaves are also used in traditional medicine in some cultures. The leaves are said to have anti-inflammatory and antibacterial properties. They are also used to treat a variety of other conditions, including diarrhea, dysentery, and hemorrhoids.
It is important to note that Triadenum japonicum leaves may interact with certain medications, so it is important to talk to your doctor before using them.
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