Second day of the Big Bend Nature Fest -- Elizabeth and I went to excellent lectures by Greg Lasley, Chuck Sexton and others. Learned a ton. Before the ice cream social, we walked around a nearby trail to the lodge. :)

I'll have to work on the ID's for many of these later on. LOTS of new plants and critters for me in Big Bend! :)

I thought this was going to be slender greenthread (T. simplicifolium) but I noticed that the outer phyllaries around the base of the flowers looked a little different than the plants here in my wildflower garden in Austin. Further delving into the key in C&J leads me to this taxon. Notice also that the disk corollas are mostly red-brown (with yellow-tipped lobes on the corollas), which helps to distinguish it from T. simplicifolium.