One of the mysteries of the English language finally explained.
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).
Late Middle English. From park + the plural of leaf.
park leaves/ˌpɑːk ˈliːvz/
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