I looked up your growzone and general climate, and you need 'warm weather' greens. This is a link giving some detail for plants that will produce edible greens in 90f/32c ...
http://www.gardenbetty.com/2012/06/summer-lovin-salad-greens/
Edible red leaf amaranth ('Chinese spinach')
Perpetual Spinach (in Chard family but tastes more spinach)
Vulcan Chard ('rhubarb' chard)
Komatsuna ('mustard spinach') fastest grower, soonest producer
Malabar Spinach (a climbing vine)
Tokyo Bekana (sort of a Chinese cabbage) mustardy taste
Yukina Savoy- will grow all summer in a 10b climate (aka a never sees frost in winter climate, so will take heat)
Mizuna (Japanese mustard)
Bloody Dock (Bloody Sorrel, red veined Dock) Likes it wet
Butterhead Speckles lettuce - takes some care and a late spring start