Ballota nigra subsp. foetida (Vis.) Hayek

POWO follows these authorities in synonymising this name:

• Castroviejo, S. & al. (eds.) (2010). Flora Iberica 12: 1-650. Real Jardín Botánico, CSIC, Madrid. [Cited as Ballota nigra.]
• Dimopoulos, P., Raus, T., Bergmeier, E., Constantinidis, T., Iatrou, G., Kokkini, S., Strid, A., & Tzanoudakis, D. (2013). Vascular plants of Greece. An annotated checklist: 1-372. Botanic gardens and botanical museum Berlin-Dahlem, Berlin and Hellenic botanical society, Athens. [Cited as Ballota nigra subsp. meridionalis.]
• Hassler, M. & Muer, T. (2022). Flora Germanica: alle Farn- und Blütenpflanzen Deutschlands in Text und Bild 2: 865-1712. Verlag Regionalkultur, Uberstadt-Weiher. [Cited as Ballota nigra subsp. meridionalis.]
• Stace, C. (2019). New Flora of the British Isles ed. 4: 1-1266. C & M Floristics. [Cited as Ballota nigra subsp. meridionalis.]

This name was accepted following an alternative taxonomy by these authorities:

• Arbo, M.M. & al. (2018). Flora Argentina. Flora vascular de la República Argentina 20(1): 1-488. INTA, IMBIV & IBODA. [Cited as Ballota nigra subsp. foetida.]
• Govaerts, R. (1996). World Checklist of Seed Plants 2(1, 2): 1-492. MIM, Deurne. [Cited as Ballota nigra subsp. foetida.]
• Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Ballota nigra subsp. foetida.]
• Mirek, Z., Piękoś-Mirkowa, H., Zając, A. & Zając, M (2020). Vascular plants of Poland an annotated checklist: 1-526. W. Szafer institute of botany, Polish academy of sciences, Krakow, Poland. [Cited as Ballota nigra subsp. foetida.]
• Werier, D. (2017). Catalogue of the Vascular plants of New York state. Memoirs of the Torrey Botanical Club 27: 1-542. New York Botanical Garden. [Cited as Ballota nigra subsp. foetida.]