I previously mis-identified this plant.  Additional pictures of it can be found under Plants on the Prairie–all Other Colors.  This plant illustrates the problem with common names.  Usually it is called a 4 0’clock.  Too hackneyed.  I found a Canadian site that gives the common name “Umbrellawort.”  I much prefer that so I use it.  The bracts look a little like tiny umbrellas and the word “wort” is Old English for “flower.”

Wing-Fruited Sand Verbena (Tripterocalyx micranthus)

Wing-Fruited Sand Verbena (Tripterocalyx micranthus)

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