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Perovskia abrotanoides
http://www.boga.ruhr-uni-bochum.de/html/Perovskia.abrotanoides.ja2.jpg
photo
Perovskia atriplicifolia
http://www.em.ca/garden/per_perovskia1.html
Short description and photos of plants with flowers.
Perovskia filigran
http://www.roslynnursery.com/GeneratedItems/pictures/p_perov-filigran.jpg
Photo