hog's fennel
/ˈhɒɡz ˌfɛnl/noun
Any of several plants having finely divided leaves like those of fennel; specifically (a) a plant of the genus Peucedanum (family Apiaceae (Umbelliferae)), especially sow-fennel, P. officinale; (b) stinking chamomile, Anthemis cotula (family Asteraceae (Compositae); also called dog-fennel.
Origin
Early 16th century; earliest use found in Herball. In some forms from the genitive of hog + fennel, although the first element has apparently sometimes been apprehended as plural. In some forms from hog + fennel.