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Hedeoma apiculatum
http://nmrareplants.unm.edu/reports/hedapi.htm
Photo,habitat,and distribution of Hedeoma apiculatum
Hedeoma hispida page
http://www.missouriplants.com/Blueopp/Hedeoma_hispida_page.html
Photo, Description and horticultural data for Hedeoma hispida
Hedeoma pulcherrimum
http://nmrareplants.unm.edu/reports/hedpul.htm
Photo,description, habitat and distribution of Hedeoma pulcherrimum
The Herb Hunters Guide: American Pennyroyal
http://www.hort.purdue.edu/newcrop/herbhunters/pennyroyal.html
Common names, habitat, description and ethnobotanical uses for Hedeoma pulegioides.