母子草

Literally, “mother and child grass”, 母子(ははこ) (hahako, “mother and child”) + 草(くさ) (kusa, “grass, plant”). The kusa changes to gusa as an instance of rendaku (連(れん)濁(だく)).

• IPA^(key): [ha̠ha̠ko̞ɡɯ̟sa̠]

母(はは)子(こ)草(ぐさ) or 母子草(ハハコグサ) • (hahakogusa) 

1. Pseudognaphalium affine, a species of cudweed

   Synonyms: 御形 (gogyō), 麹花 (kōji-bana), 母子 (hahako), 餅艾 (hana yomogi)

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