buckthorn

(noun) a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments.

(noun) any shrub or small tree of the genus Bumelia.

(noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions. Synonyms: English plantain, narrow-leaved plantain, ribgrass, ribwort, ripple-grass, Plantago lanceolata.