United States, Texas, Jeff Davis, In crevices of rhyolite on vertical palisade rimrock walls at top of slope on NW side of ridge (divide) between Madera Canyon and Bicycle Canyon, ca. 0.7 airmiles SW of Blue Tank, 4.1 airmiles E of 6652 summit of Robbers Roost Mt., on Caldwell Ranch. Frie
30.7825 -104.0525
Occasional in crevices of rhyolite on vertical palisade rimrock walls. Associates include Philadelphus serpyllifolius, Perityle sp., Selaginella sp., Silene laciniata, Agastache sp.