The name of the flower is

I looked and looked and finally found the name of the South African bulb, actually it is a corm and it is not a crocosma as many suggested, I grow them and they are flowering in late summer not winter. This is the yellower form of Chasmanthe aethiopica, it could well have changed its name but that is what my old bulb book tells me it is. It says it is frost tender but it has never succumbed to frost with me and definetly wants to take over. It is either burnt orange or yellow.