It grows in the same ecosystems as Daucus, and there is a great chance of mistaking the two. Stem hairy 2. No purple spots on stem, but sometimes purple blotches 3. White root smells like a carrot. Purple spots on stem 3.
Root smells like urine at best.
Please use all three characteristics, not just one of them. The smells of the Hemlocks seem to change depending on environmental and other factors. I have smelled Hemlock seeds that have pleasant fennel-like aromas. I have smelled poisonous groundsel roots, Senecio triangularis, that have the musky bouquet of Valerian, Valeriana sitchensis. Perhaps the fact that the Senecio was growing in a mat of Valeriana had something to do with it.