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Vitex rotundifolia L. f. - Lamiaceae - round-leaf chastetree, beach vitex
Prostrate shrub, up to 1m tall, native to the seashores of the Pacific and Western Indian Ocean; leaves obovate to broadly oblong-elliptic, or circular, adaxially pale dull green, abaxially velvety to silky tomentose; flowers purplish mauve to lilac blue.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=210002310
„Leaves are strongly aromatic, intensifying when crushed.“
http://en.wikipedia.org/wiki/Vitex_rotundifolia
„Vitex rotundifolia has long been used as a medicinal plant for a headache and a cold, and various compounds such as flavonoid, iridoid glycosides, diterpenoids, and sesquiterpenoids have been identified in this plant (Kimura et al., 1967; Asaka et al., 1973; Tada and Yasuda, 1984). It also has been reported that the leaves and twigs of this plant can be used for repelling mosquitoes… the mosquito-repelling principle
of V. rotundifolia… [was] isolated [as] a new natural cyclopentene dialdehyde named rotundial… the repellency of [rotundial after 2 hours] became higher than that of DEET, indicating that the mosquito repelling activity of rotundial was superior to that of DEET in respect to its long-lasting effectiveness.“
[Potent mosquito repellents from the leaves of Eucalyptus and Vitex plants., Nishimura, H., Satoh, A., In: Biologically active natural products: Agrochemicals, CRC Press, Boca Raton, 1999, 137-146]
drawing from Flora of China