]> GH barcode-00351954 Mexico N-facing slopes just S. of Pan-Am Highway at Pass of Monte Rio Frio (5 km WNW of Rio Frio) at Llano Grande Romanschulzia orizabae (Schlechtendal & Chamisso) O. E. Schulz (Schlechtendal & Chamisso) O. E. Schulz 2013-10-03 10:16:37 H. H. Iltis, R. C. Koeppen & F. S. Iltis