lobeline

Japanese: lobeline

...It is distributed throughout Japan and widely in East Asia. It contains the toxic substance lobeline, but young shoots are sometimes boiled, drained, and then eaten. The same genus, L. chinensis Lour. (also known as Azemushiro), is a creeping perennial plant that grows in moist places such as rice field ridges and ditches, and has white flowers, one in each leaf axil. ...

From [Lobelia]

...It is used for medicinal purposes and has become a naturalized plant. The whole plant of lobelia contains the alkaloid lobeline. Lobeline is used as a respiratory stimulant and emetic for breathing difficulties such as whooping cough and asthma.

*Some of the terminology that mentions "lobeline" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…日本全域のほか，東アジアに広く分布している。有毒物質ロベリンlobelineを含むが，若芽をゆでて煮こぼし，さらしてから食用にすることもある。同属のミゾカクシL.chinensis Lour.(一名アゼムシロ)は，田のあぜや溝のそばなどの湿った所に生育する匍匐（ほふく）性の多年草で，花は葉腋（ようえき）に1個ずつつき，白色。…