Your mystery plant is very pretty… the leaves look a bit like velvetleaf, which I think is in the abutilon/malva family.    From Wordnik.com.  [Bloom Day/Weed Day July 2009 « Fairegarden] Reference

Effects of fluometuron on photosynthesis, respiration and ultrastructure of developing velvetleaf seedlings.    From Wordnik.com.  [xml's Blinklist.com] Reference

In addition, Flexstar GT will control morningglory and velvetleaf, which tend to be tough ones for glyphosate alone.    From Wordnik.com.  [Delta Farm Press RSS Feed] Reference

Ignite also controls Palmer amaranth, woolly cupgrass, velvetleaf, cocklebur, foxtails, ragweeds and waterhemp, along with ALS-resistant and glyphosate-resistant weeds, according to Bayer.    From Wordnik.com.  [Western Farm Press RSS Feed] Reference

V. myrtilloides (velvetleaf huckleberry).    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference