Cirsium undulatum

A widespread and variable thistle. The leaves usually have more strongly undulate margins than those seen below, as the specific epithet indicates.

A pseudanthium at Aguirre Springs on the east side of the Organ Mts., 2 Oct 2006.

Plant habit at Aguirre Springs, 2 Oct 2006.

An upper cauline leaf at Aguirre Springs, 2 Oct 2006.