A worldwide community photographing and learning about wildlife
Neomarica longifolia
It's the 'Yellow Walking Iris'. This sun, heat, humidity and drought hardy plant stays green all year and grows in grassy clumps to around a metre in height .
Dan beat me too, But here's another http://www.projectnoah.org/spottings/741... ;-)
Ha! I couldn't post my suggestion due to "server error" but when I came back here, you'd made the same one Dan. I presume this was in a garden.