Despite leo's best intentions, only a handful of rain Lilies have a foliage to ID with some certainty. The immense majority look alike, this having seen/grown most of the Mexican and S. American species. Rainlilies are Zephyranthes, Habranthus, Haylockia, Pyrolirion, Cooperia and Rhodophiala, so you see it is huge group of plants, yet only these have distinct foliage Habrantus estensis Habranthus pedunculosus/juncifolius/teretifolius Habranthus gracilifolius/ruber Zephyranthes grandiflora/carinata/robusta/minuta Cooperia "Mexican" traubii