to tropical)
**Populus euphratica - Euphrates poplar (North Africa, southwest and central Asia)
**Populus ilicifolia - Tana River poplar (East Africa)
*Populus section Abaso - Mexican poplars' (Mexico; subtropical to tropical)
**Populus guzmanantlensis (Mexico) (may be conspecific with Populus simaroa)
**Populus mexicana