Mexico, Hidalgo, Along Hwy. 105 between Pachuca and Tampico, along road to San Cristóbal wich leaves main Hwy. 100.8 mi NE of Pachuca, vicinity of turnoff, 1.5 km from San Cristóbal, 10.5 mi S of Santa Marfa; 36.4 mi S of Huejutla; steep banks along road, Hgo.
20.96667 -98.63333
steep banks along road and on forested slopes. In dense clumps on wet bank