This plant is the perfect example of why you should not trust me, or me others.  I previously called this a Wing-Fruited Verbena because I found this exact plant on what looked to be a trusted site–and usually is–and took the name without question.  I nod to it familiarly every September as it flourishes in my neighborhood.   I like to know the plants and say “That’s my old friend Wing-Fruited.”   Then it struck me that it did not resemble other verbenas at all.   I couldn’t find it in Weber’s Colorado Flora of the Eastern Slope, the botanist’s bible and panicked.  My pictures appeared on a Google search, pretty, but utterly wrong.  Bad Information.  Beware!  After harassing three professional botanists, or near-professional, Jennifer Ackerfield  of CSU put me on the correct course.  Now I had to learn to call it a Linearleaf Four O’Clock, not a very pleasing common name, so I searched a Canadian website and found the name “Umbrellawort,” which I much prefer.  The bracts look somewhat like tiny umbrellas and “wort” is Old English for “flower.”  So Umbrellawort it is.

Wing-Fruited Sand Verbena (Tripterocalyx micranthus)

Wing-Fruited Sand Verbena (Tripterocalyx micranthus)

This, below, is the flower.  In full bloom.

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