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The Southwest Colorado Wildflower site reports "John Clayton named this genus in 1762 and the species was at first named Brittonastrum pallidiflora by Amos Heller in 1899. Per Axel Rydberg renamed it Agastache pallidiflora in 1906. Greek gives us both "agan" ("many") and "stachys" ("spikes") "Pallidiflora" is Latin for "pale flower"."
Two subspecies are identified - Agastache pallidiflora ssp. pallidiflora (native to Arizona, Colorado and New Mexiso) and Agastache pallidiflora ssp. neomexicana (native to New Mexico and Texas).