Lavandula angustifolia, formerly L. officinalis, is a flowering plant in the family Lamiaceae, native to the Mediterranean (Spain, France, Italy, Croatia etc.). Its common names include lavender, true lavender or English lavender (though not native to England); also garden lavender, common lavender, and narrow-leaved lavender.
Lavender absolute is a dark green, viscous liquid of very rich, sweet-herbaceous, somewhat floral odor; in dilution, it bears a close resemblance to the odor of the flowering lavender shrubs. Its woody-herby undertone and coumarin-like sweetness duplicate the odor of the botanical material far better than does the essential oil. The absolute is sweeter but less floral than the essential oil, and the two materials can form a very pleasant combination.
Arctander, Steffen . Perfume and Flavor Materials of Natural Origin (p. 403).