Perilla frutescens var. purpurascens

Perilla frutescens var. purpurascens

Perilla frutescens var. purpurascens (Hayata) H. W. Li.
Engl.: purple perilla, purple-leaved common perilla, purple common perilla, wild perilla.
Deu.: Schwarznessel, Rotes Shiso.
Jap.: aka shiso.
TCM: tia to.
Bot. syn.: Dentidia purpurascens Pers., Dentidia purpurea Poir., Perilla frutescens (L.) Britt. var. acuta (Thunb.) Kudo., Perilla frutescens (L.) Britt. var. atropurpurea, Perilla ocymoides L. var. purpurascens Hayata.

I have no articles for this botanical term, but there might be some for the next level down (if found).