Verbena officinalis L.
Data source(s):
- Anon. 1993. Index Kewensis (CD ROM).
- Huxley, A.J. 1992. The new Royal Horticultural Society dictionary of gardening. Vol. 1-4. London, p.(4)649
- Lord, T. 1999. The RHS plant finder. 1999-2000 edition. London: The Royal Horticultural Society, p.732
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