It is a long road to Xilitla from San Miguel de Allende in México; six hours of driving without stopping. Stops are however necessary, not only for enjoying the plants along the way at the height of wildflower season, but also for the calls of nature. Sometimes the two are combined.
At one spot along the highway, distant from any public facilities, are two roadside vendor shacks perched at the top of an embankment with just the right distance between them to afford some comfortable privacy. Looking down from the top of the embankment, as one must, one observes floral displays such as these.
I count six species in bloom, three each from the mint and aster families. The mints are the tall blue-flowered plants in the back (almost certainly a species of Salvia), the small, light blue-flowered plants in the bottom right (perhaps a Salvia sp.), and the prominent orange-red flowered Leonotis nepetifolia in the lower middle of the frame. The latter species is an introduced escapee from tropical Africa and southern India.
In the bottom left corner of the photograph are two asteraceous species I’ve yet to identify–perhaps the yellow-ray flowered one is a species of Bidens (I won’t guess for the white-ray flowered species). The third species in the family, primarily in the bottom right corner but also much of the out-of-focus background, is a species of Tagetes or Mexican marigold. It is almost certainly Tagetes lunulata, collected frequently along the roadside in the area (see Tagetes lunulata in Flora Del Bajío y de Regiones Adyacentes (Fascículo 113): Familia Compositae: Tribu Tageteae (PDF)).