I know that before reintroducing Streptanthus bracteatus (Bracted
Twist-flower), DNA studies are being done to see if there are any
genetic differences in populations at different central Texas sites.

My brother planted a Desert Willow in Dallas. In Sally Wasowsky's books
and other references, it's listed as a 'native plant'. It may be native
to Texas, but Dallas is a long way from west Texas. (Just one example of
many.)

-Nancy