vitex

1 Vitex :  a large genus of chiefly tropical shrubs and trees (family Verbenaceae) having divided leaves and forking cymes of small flowers with a short tube and bilabiate limb

2 plural vitexes :  any plant of the genus Vitex; especially :  chaste tree 1 These are plants we should ask nurseries to grow for us again. We proved with vitex that demand could ensure a steady supply. — Neil Sperry, Fort Worth Star Telegram, 21 Jan. 2012

3 plural vitexes :  chaste tree 2 He guides them through a careful six-month transition, slowly shifting the balance from drugs to herbs such as vitex and black cohosh. — Erika Lenz, Utne Reader, May/June 1999