南蛮繁縷

Literally, “southern barbarian chickweed”, compound of 南蛮(なんばん) (nanban, “southern barbarian”) + 繁縷(はこべ) (hakobe, “chickweed”)

南(なん)蛮(ばん)繁縷(はこべ) or 南蛮繁縷(ナンバンハコベ) • (nanban hakobe) 

1. Silene baccifera, a species of campion

   Synonym: 蔓仙翁 (tsuru-sennō)

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