I almost missed them as I strolled past with camera in hand. I was looking around for subjects to photograph. These Prairie Spiderwort flowers (Tradescantia occidentalis) peeked over the edge of the ditch and caught my eye in the bright sunlight. They are common in the Great Plain of the U.S., but are listed as threatened in Canada.
Prairie Spiderwort can be a bioassay for radiation. The stamen hairs are normally blue as in these photos. But, exposed them to energetic neutrons, Gamma rays, X-rays, and the higher energy ultraviolet, the hairs turn pink.