I wavered in my identification of today’s plant. Is it Salvia microphylla (blackcurrant sage) or Salvia greggii (autumn sage)? Complicating matters is that the two have overlapping ranges in the mid- to high-elevations of eastern Mexico, and, apparently, the two species will hybridize.
I’ve tentatively chosen Salvia microphylla on the characters of leaf shape and leaf margin as suggested by the linked article–the leaves are neither narrow or smooth-edged, as one might expect to find in Salvia greggii. However, both taxa are noted as being “highly variable” in morphology, and with the possibility of hybridization, someone who knows the group better than myself may have to step in and correct me.
Photography resource link: enjoy the wildlife and nature photography of Montreal photographer Jacques-André Dupont!