pudding grass
/ˈpʊdɪŋ ˌɡrɑːs/ /ˈpʊdɪŋ ˌɡras/Now chiefly historical and English regional (northern )
noun
The plant pennyroyal, Mentha pulegium, an ingredient in herb puddings and stuffings. Also ( United States regional ( west )): American pennyroyal, Hedeoma pulegoides ( rare ).
Origin
Mid 16th century; earliest use found in William Turner (d. 1568), naturalist and religious controversialist. From pudding + grass.