You can try Kleinia petraea (formerly Senecio jacobsenii):
When I first got this in June 2013 it managed to bloom after a month, I guess it was transitioning from the cooler area I got it from and into our furnace temps: I was not sure how to grow this plant then, just observing how it goes:
I have repotted it in a different container in late 2014. Photos taken in April 2015 - it endured our cool mild winters nicely, and gets nice chilled purplish leaves:
Photos this morning 24Sept2015: It has tolerated very well our extremely long dry hot days here this summer, since they get partially shaded by our city trees. Water once a week only, though if the forecast then was triple digits for several days, I really give them a good thorough watering the day before the heat wave comes about.
Our area is really hot and dry during summer, really dismal this year with our ongoing drought conditions. Humidity here can go into single digits. Succulents for the most part can endure the heat as long as they are kept in part shade, and they still need a good thorough watering at least once a week. They will also get fried if exposed to intense direct afternoon sun, so some part shade will help them a lot.
You can also try bougainvillea or mandevilla. They thrive here too, but come winter they both go deciduous and just comes back when warmer weather returns. Both are quite drought tolerant once established, but our dry conditions here is quite extreme and growing them in containers, it helps to water them at least every other day.
You can also try rat tail cacti. I usually get blooms in Spring:
After Spring, it is just all leaves..still pretty as it endures our hot days here:
