Dietes.  Some call these "African Irises."  They are members of the Iris Family.  

This is Dietes grandiflora.  "Fortnight Lily"  This plant can bloom during the winter [if it doesn't get frozen] and in the spring.  Notice it is in a sheltered location.  

Dietes bicolor.  This is a spring bloomer.  Notice it also is in a sheltered location.