There are several genera commonly referred to as a grass snake that all belong to the family Colubridae in separate subfamilies.

Species

North American grass snakes:

• rough_green_snake (Opheodrys aestivus)
• smooth_green_snake (Opheodrys vernalis)

European / Asian grass snakes:

• barred grass snake (Natrix helvetica)
• common_grass_snake (Natrix natrix) - Also known as the European grass snake.
• iberian_grass_snake (Natrix astreptophora)

External links

• https://en.wikipedia.org/wiki/Grass_snake