Scarlet monkeyflower (Erythranthe cardinalis, formerly known as Mimulus cardinalis before a 2012 reclassification based on DNA evidence). Photographed in Elves Chasm at Colorado River Mile 117.2 (measured downstream from Lees Ferry). Day 8 of 16 days rafting 226 miles down the Colorado River in Grand Canyon National Park, Arizona, USA.
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