Jim Stasz @ USDA-NRCS PLANTS Database
The common dittany, (Cunila origanoides L.), is a herbaceous perennial and a member of the mint family. The name means “like oregano” and from July to September/October, the plant shows purplish flowers. In late autumn or early winter, it can create “frost flowers” when the water pushes out of the roots and freezes in the form of tiny ice sculptures. In warmer weather, the flowers attract butterflies, skippers, bees and other insects.
Source list: USDA, NRCS. 2014. The PLANTS Database (http://plants.usda.gov, 16 June 2014). National Plant Data Team, Greensboro, NC 27401-4901 USA; http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=j950; Plants for a Future database (http://www.pfaf.org/user/Plant.aspx?LatinName=Cunila+origanoides); The Green Farmacy Garden (http://thegreenfarmacygarden.com/page/2/) MDC Online (http://mdc.mo.gov/discover-nature/field-guide/dittany )
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