oldham blueberry; Vaccinium oldhamii
A deciduous shrub native to East Asia, producing edible blue-black berries. The name literally means 'summer haze'.
In autumn, the berries of the oldham blueberry ripen to black.
Rare kanji spelling; the plant is normally written in kana.
The name ナツハゼ (夏櫨) combines 夏 (summer) and 櫨 (haze, a type of wax tree), possibly referring to the summer fruiting season and resemblance to haze trees. The exact derivation is uncertain.