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Dracocephalum
http://botanicalresources.1hwy.com/Dracocephalum.html
An introduction to the genera, list of species and synonyms, and selected photos.
Dracocephalum parviflorum
http://www.swsbm.com/Images/New9-99/Dracocephalum_parviflorum.jpg
photo
Plant Profile for Dracocephalum
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=DRACO
Dracocephalum's distribution by state, classification, thumbnails, and related taxa.
Plant Profile for Dracocephalum thymiflorum
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=DRTH
Horticultural data and distribution of Dracocephalum thymiflorum