noun
A flowering plant, Orychophragmus violaceus, native to East Asia. The name is usually written in katakana.
春になると、オオアラセイトウが紫色の花を咲かせる。
In spring, Chinese violet cress blooms with purple flowers.
The Japanese name オオアラセイトウ (大紫羅欄花) is a compound of 大 (ō, 'large') and アラセイトウ (araseitō, 'stock', Matthiola incana), referring to its resemblance to stock flowers. The kanji 紫羅欄花 is ateji for アラセイトウ.