Jardín Botánico Francisco Javier Clavijero, Xalapa, Veracruz, MÉXICO
This allthorn was photographed in the open high elevation grasslands a bit east of the community of Tanque de Emergencia, S of Saltillo, in Coahuila, Mexico. Elevation is about 7100 ft (2150 m). This is the habitat (at least in the winter) of Worthen's Sparrow. A small flock of this species was seen in this shrub clump. Scanned from 35mm slide.
The Brassicales are an order of flowering plants, belonging to the eurosids II group of dicotyledons under the APG II system. One character common to many members of the order is the production of glucosinolate (mustard oil) compounds. Most systems of classification have included this order, although sometimes under the name Capparales (the name chosen depending on which is thought to have priority).