Leaves on the Dyeweed (Emory's indigo) bush Psorothamnus emoryi. The name 'dyeweed' comes from the persistent iodine color that stains your fingers if you damage a leaf.
I determined using Google Street View that this is the bus terminal in Catamarca
Close-up of flower on a Dyeweed (Emory's indigo) bush Psorothamnus emoryi
This Orcutt's woody aster Xylorhiza orcuttii was pointed out as having unusually white petals.
Desert sand verbena Abronia villosa