On cf. Allium (which was abundant) in open sagebrush shrub community on gentle S-facing slope.
Description
Likely common? Many of the (abundant) cf. Allium in this spot had their leaves yellowing at the tips, but only a few had these obvious pustules. However, we saw the same thing up the canyon by the Hardware Ranch Nature Center, so it was potentially widespread.
Voucher image
Photos posted on iNaturalist: https://www.inaturalist.org/observations/211080803.