This bright little flower grows in abundance in my mum's garden. She calls it a bumble bee orchid, and quite possibly that is one of its common names. But I've been unable to determine it's proper scientific name. Some research suggests that it is of the genus Oncidium. Any flower experts out there?

Update (June 27) : I've been reliably informed by the helpful folk at the Trinidad and Tobago Orchid Society that this is actually an iris or a lily, and not an orchid. However they didn't know what species of iris/lily so the quest continues.

Update (June 28) : With the help of the folks at Gardenweb's Name That Plant! forum I've identified the flower as a Trimezia martinicensis, commonly known as a Tiger Eye Iris, or a Yellow Walking Iris. There's still one slight hiccup though, some sources also list the species as a Neomarica longifolia. They look the same to me but one never knows.