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Related to chaste tree: Vitex
Any of several shrubs or trees of the genus Vitex, especially two cultivated species (V. agnus-castus and V. negundo) having aromatic, palmately compound leaves and clusters of usually lilac flowers.
[Partial translation of Medieval Latin agnus castus : Greek agnos, chaste tree (of unknown origin, but associated by folk etymology with Greek hagnos, pure, since it was strewn in bedchambers during Greek religious festivals requiring sexual abstinence ) + Latin castus, chaste.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Plants) a small ornamental verbenaceous tree, Vitex agnus-castus, of S Europe and SW Asia, with spikes of pale blue flowers
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014