Solanaceae

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.

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.

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.

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.

rare white flowering sport. 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.

Typical armament. Roadside in steeply sloping volcanic rhyolite tuff rubble at mid canyon. SYN: S. houstonii. 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.

plants on steep slope of accumulated volcanic rhyolitic tuff rubble and alluvium of lower canyon in deciduous small tree forest with Acacia, Ipomoea, Bursera, Celtis, Lysiloma, Tecoma. Some place this plant as a synonym under the more tropical species, S. houstonii.

plants on steep slope of accumulated volcanic rhyolitic tuff rubble and alluvium of lower canyon in deciduous small tree forest with Acacia, Ipomoea, Bursera, Celtis, Lysiloma, Tecoma. Some treat this plant as a synonym under the more tropical species, S. houstonii.

rocky igneous hillside with Desmanthus covillei, Dalea pringlei, Cylindropuntia arbuscula, Cardiospermum halicacabum, Ambrosia ambrosioides. Some authorities place this plant in synonimy under S. houstoni but there is sufficient doubt to leave it here for now until the issue is resolved

rocky igneous hillside with Desmanthus covillei, Dalea pringlei, Cylindropuntia arbuscula, Cardiospermum halicacabum, Ambrosia ambrosioides. Some authorities place this plant in synonimy under S. houstoni but there is sufficient doubt to leave it here for now until the issue is resolved

rocky igneous hillside with Desmanthus covillei, Dalea pringlei, Cylindropuntia arbuscula, Cardiospermum halicacabum, Ambrosia ambrosioides. Some authorities place this plant in synonimy under S. houstoni but there is sufficient doubt to leave it here for now until the issue is resolved

rocky igneous hillside with Desmanthus covillei, Dalea pringlei, Cylindropuntia arbuscula, Cardiospermum halicacabum, Ambrosia ambrosioides. Some authorities place this plant in synonimy under S. houstoni but there is sufficient doubt to leave it here for now until the issue is resolved

rocky igneous hillside with Desmanthus covillei, Dalea pringlei, Cylindropuntia arbuscula, Cardiospermum halicacabum, Ambrosia ambrosioides. Some authorities place this plant in synonimy under S. houstoni but there is sufficient doubt to leave it here for now until the issue is resolved

rocky igneous hillside with Desmanthus covillei, Dalea pringlei, Cylindropuntia arbuscula, Cardiospermum halicacabum, Ambrosia ambrosioides. Some authorities place this plant in synonimy under S. houstoni but there is sufficient doubt to leave it here for now until the issue is resolved