Heracleum maximum Bartr. (syn. H. lanatum). This is the common, tall, white-flowered member of the Carrot family that tends to make it difficult to discern a number of other species of the Apiaciae that superficially resemble it. Most references have historically referred to this as Heracleum lanatum. in Intermountain Flora vol. 3A (1997) p. 426 by Cronquist et al, the opinion was expressed that H. maximum was not considered as being validly published due to an inadequate description. However, since then, the debate has apparently turned back to accepting H. maximum, but still a species that has been thought to occur over much of not only North America but also Eurasia. The name H. sphonydlium subsp. (and var.) lanatum, is also considered by many a synonym for this taxon. But, there are some ongoing taxonomic discussions, per Dr. James Reveal, that perhaps the North American plants are H. sphondylium and distinct on some basis from the Eurasian H. maximum and it is being treated that way by some taxonomists. July 22, 2011, Millcreek Canyon, Wasatch range, Salt Lake County, Utah, at about 7,180 ft. elev.