Matsukazesou (Japanese pine wind grass) - Matsukazesou (English spelling) Boenninghausenia japonica

Japanese: マツカゼソウ(松風草) - マツカゼソウ（英語表記）Boenninghausenia japonica

A perennial plant of the Rutaceae family. It grows in forests and in the shade of trees in mountainous areas in Honshu, Shikoku, and Kyushu, west of the Kanto region. The stem is cylindrical, 40-80 cm tall, and green with a tinge of powdery white. The leaves are trifoliate, pinnate, compound, with transparent oil spots, and fragrant. The leaflets are obovate, entire, and have rounded tips. In summer, the panicles grow terminally and produce many small white flowers. The calyx and petals are four, both oblong. The petals are about 4 cm long, but the sepals are much smaller. There are six to eight stamens, some longer than others, that protrude beyond the flower. The ovary has a stalk, and the capsule is divided into four egg-shaped fruits. The seeds are dark brown and wrinkled on the surface. Only one other species of this genus is known from India to China.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

ミカン科の多年草。関東地方より西の本州と四国，九州の山地の林内や樹陰に生える。茎は円柱状で高さ 40～80cmになり，粉白を帯びた緑色をしている。葉は3回3出の羽状複葉で透明な油点があり，香気がある。小葉は倒卵形で全縁，先は丸い。夏に円錐花序を頂生し，白色の小花を多数つける。萼と花弁は4個でともに長楕円形，花弁は長さ 4cmほどあるが萼片ははるかに小さい。おしべは6～8本で長短があり，花の外にまで突き出す。子房には柄があり，蒴果は卵形の4分果に分れる。種子は暗褐色で表面に皺がある。同属の植物はもう1種だけインドから中国にかけて知られている。

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