羽衣草

Literally, “feather-robe plant”, compound of 羽衣(はごろも) (hagoromo, “feather robe”) + 草(くさ) (kusa, “grass, plant”). The kusa changes to gusa as an instance of rendaku (連濁).

羽(は)衣(ごろも)草(ぐさ) or 羽衣草(ハゴロモグサ) • (hagoromogusa) 

1. Alchemilla japonica, a species of lady's mantle

As with many terms that name organisms, this term is often spelled in katakana, especially in biological contexts (where katakana is customary).

羽(は)衣(ごろも)草(そう) • (hagoromosō) 

1. synonym of 鋸草 (nokogirisō, “Siberian yarrow, Achillea alpina”)