I try to go to the Big Bend at least once a year. (I have some land there) Lots of great stuff to see. Here's a sampling of my last couple of visits.Ariocarpus fissuratus
Thelocactus bicolor
Echinocereus enneacanthus
Coryphantha echinus
Mammillaria pottsii
Mammillaria lasiacantha
Echinomastus warnockii
Epithelantha bokei
Glandulicactus wrightii
Ferocactus hamatacanthus
Coryphantha echinus v. robusta
My land is northwest of Terlingua, kind of hard to reach but lots of stuff to see on the way there. The historical site for bicolor is west of Lajitas but a couple of years ago I found the one in the pics from north of Study Butte. I saw the one in the pic and a couple others further from the fence but all private land so could not explore further. The population west of Lajitas is pretty big and you can explore there as it is on Big Bend Ranch SP.
Rob,
Man it just gets better! I really enjoy these habitat pictures. I have been dreaming of a trip to the Big Bend area for years. Perhaps 2010 will be the year. I haven't been East of Arizona or South of Colorado.
Thanks for posting!
Daiv
All Cacti are succulents, but not all succulents are Cacti