Leaves single veined, spatulate-obovate with petioles, adaxially pubescent.
An absurdly large single-veined plant with basal leaf characters most consistent with a. howellii, but strange enough to cast doubt without seeing the upper cauline leaves.
Little Grand Canyon Trail
SBEE, 20, button bush
I think this is non-native invasive Pale Smartweed versus the lookalike smartweed that is native. TIA