Cylindropuntia imbricata in front of the Bauer farmstead in Guadalupe River State Park.
An impossibly large Opuntia growing out of an impossibly small disc in San Antonio. Perhaps the roots have grown through the pipe?
Yucca rostrata at Barton Springs Nursery in Austin, TX. The Yucca is now living on my brother's patio in Austin, hopefully to be transported to Seattle when my family visits next.
I also purchased an Agave geminiflora 'Spaghetti Strap' at Shades of Green in San Antonio. I fell in love with a large specimen of Agave ornithobroma, a close relative, at Cistus Nursery. Unfortunately, neither are reliably hardy in zone 8b. Other purchases included a Nolina nelsonii & Chamaerops humilis var. cerifera (Barton Springs), Agave bracteosa (East Austin Succulents) and a Sansevieria bacularis/sulcata (Great Outdoors). Sadly, the last purchase is yet another houseplant, but I have a weakness for Sansevierias.