Lemmon's Cologania

pine understory in rocky, volcanic tuffaceous rhyolite soil on gently undulating plain forming Madrean plateau

pine understory in rocky, volcanic tuffaceous rhyolite soil on gently undulating plain forming Madrean plateau

open roadside on coarse granitic roadbed mixed over substrate of volcanic tuff and tuffaceous rhyolite at crest of the eastern escarpment onto Madrean plateau.

shallow soil pocket on open volcanic tuff slope along trail above river

clearing in pine flats of the Madrean highlands on shallow volcanic soil over rhyolitic tuff substrate