yellow flowering S. heterodoxum plants on left, blue flowering S, rostratum on right, both on disturbed, silty, volcanic alluvium in roadside drainage swale running through a largely abandoned old village and agricultural area
roadside in steeply sloping volcanic rhyolite tuff rubble at mid canyon. Sites along the old gravel switchback road have now been largely destroyed by a new paved highway to Batopilas that also greatly restricts access to many former rich roadside collecting sites in the canyon.