black mangrove (Bruguiera gymnorrhiza)
A mangrove species found in coastal areas of the Indo-Pacific, including southern Japan. The name is usually written in katakana.
Black mangroves are commonly seen in the mangrove forests of Okinawa.
Katakana spelling is standard for this plant name; usually written in kana.
Rare kanji spelling; no priority for this form is specified.
The origin of the name is uncertain. The kanji 雄蛭木 literally means 'male leech tree', but this is likely an ateji (phonetic) assignment rather than a description of the plant.