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Lavandula angustifolia
http://www.msue.msu.edu/msue/imp/mod03/01700549.html
Brief notes and a photograph from Michigan State University Extension.
Lavandula angustifolia
http://www.hcs.ohio-state.edu/hcs/TMI/Plantlist/la_folia.html
Botanic notes from Ohio State University.
Lavandula angustifolia
http://www.dipbot.unict.it/orto/0622-1.html
Image of a mature plant.