I might be wrong but it looks like Veratrum viride (Indian Poke, Indian Hellebore, False Hellebore, Green False Hellebore). Here is a link that might be useful: Veratrum viride

Maybe Eriogonum umbellatum, sulphur flower, umbrella plant. It is found in Utah and the flowers fade to orange. Here is a link that might be useful: Eriogonum umbellatum, sulphur flower, umbrella plant

A number of years ago we did the out-and-back Narrows hike in late May or early June (around Memorial Day). Water was moving but current not too strong. It was beautiful but seemed there were a lot of folks out that day and I would like to do the hike again without seeing quite so many people. Same trip it snowed at Bryce Canyon. We stayed at Flanigan's outside of Zion and I would stay there again. There very well might be nicer places but budget was a big factor in our choice of lodging on that trip.

Susan this is off topic of that particular plant ID but wanted to share some articles with you regarding the plant’s smell. oils of plants may be more effective than Antibiotics: http://outbreaknewstoday.com/johns-hopkins-researchers-plant-compounds-may-better-current-antibiotics-treating-persistent-lyme-bacteria-16025/ And https://www.nationalgeographic.com/magazine/2019/01/ancient-chines-remedies-changing-modern-medicine/ Thank you for pointing out your instincts may be onto something. Also take a look into concurrent mold-related inflammations because that‘s a common thing that people can normally deal with by itself, but not when also dealing wiith Lyme. I wish you an effective recovery.