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researchgate.net
Harley, RM; Atkins, S; Budantsev, AL; Cantino, PD; etc (2004). "Labiatae"(PDF). In Joachim W. Kadereit (ed.). Flowering Plants: Dicotyledons: Lamiales (except Acanthaceae including Avicenniaceae). The Families and Genera of Vascular Plants. Vol. 7. Berlin: Springer. pp. 167–275. doi:10.1007/978-3-642-18617-2_11. ISBN9783642186172.