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Plant Profile for Pycnanthemum flexuosum
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=PYFL
Horticultural data and distribution
Plant Profile for Pycnanthemum tenuifolium
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=PYTE
Horticultural data and distribution
Pycnanthemum albescens page
http://www.missouriplants.com/Whiteopp/Pycnanthemum_albescens_page.html
Photo, description and horticultural data
Pycnanthemum pilosum
http://www.inhs.uiuc.edu/cwe/illinois_plants/ThePlants/PGenera/PycPil/PycPil.html
Photo
Pycnanthemum tenuifolium page
http://www.hawriverprogram.org/NCPlants/Pycnanthemum_tenuifolium_page.html
Photo
Virginia Mountain-mint (Pycnanthemum virginianum)
http://www.ct-botanical-society.org/galleries/pycnanthemumvirg.html
Photo and Horticultural data