Eryngium longifolium Cav.

A Mexican species not entering the United States, distinguished from other Eryngium in the area by its long, narrow basal leaves and small, inconspicuous involucral bracts.

Basal rosette near Cascada de Basaseachic, Sierra Madre Occidentál, Chihuahua, Mexico, 8 Sep 2009. Photographed on a field trip with the American Penstemon Society.

Inflorescences near Cascada de Basaseachic, 8 Sep 2009.