Definition of park leaves in US English:

park leaves

noun

English Regional
  • The plant tutsan, Hypericum androsaemum (family Clusiaceae (Guttiferae)), a large-leaved shrubby species of St John's wort. Apparently also: †the chaste tree Vitex agnus-castus (obsolete).

Origin

Late Middle English. From park + the plural of leaf.

Pronunciation

park leaves

/ˌpɑːk ˈliːvz/