noun
Veronicastrum sibiricum (species of flowering plant)
A perennial plant native to East Asia, often found in mountainous areas. The name is usually written in katakana.
クガイソウは夏に紫色の花を咲かせます。
Veronicastrum sibiricum blooms with purple flowers in summer.
The name クガイソウ is of Japanese origin, but the exact derivation is uncertain. The kanji 九蓋草 literally means 'nine-layered grass', possibly referring to the plant's whorled leaves.