For Vitex
Chen & Gilbert. 1994. Vitex. Flora of China.
de Kok, R.P.J. 2007. The genus Vitex L. (Lamiaceae) in New Guinea and the South Pacific Islands. Kew Bull. 62(4): 587-603.
Harley et al. 2004. In Kadereit, J.W. 2004. The families and genera of vascular plants. VII. Flowering plants – Dicotyledons – Lamiales (except Acanthaceae including Avicenniaceae). Springer, Berlin. 478 pp.
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