층층이꽃속 Clinopodium LINN.

1. 소포는 선형이며 소화경보다 길고 퍼진 털이 있다 ·················································································· 254. 층층이꽃

1. 소포는 소화경보다 짧거나 비슷하다.

2. 잎에 선점이 있고 꽃받침에 퍼진 털이 있다   ···················································································255. 두메층층이

2. 잎에 선점이 없거나 희미하다.

3. 꽃부리는 길이 5~6mm이고 꽃받침은 길이 3.5-4mm로서 짧은 벌이 있으며 꽃은 담홍색이다  ·························256. 애기탑꽃

3. 꽃부리는 길이 8-9mm로서 희고 꽃받침은 길이 6mm로서 짧은 털과 퍼진 털이 있다  ········································257. 탑꽃