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Blue Penstemon

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Blue Penstemon (Penstemon cyaneus) in Rotary Park near Garden Creek Waterfall, south from Casper. Wyoming, July 19, 2010
Blue penstemon in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 25, 2010
Blue beardtongue (penstemon) flowers in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, June 13, 2014

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