Cooperia drummondii

Common Name: Cebolleta, Rain-Lily

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habit - erect, solitary flowers, subtended by a conspicuous bract; appearing quickly after rains Perianth tube length is a good feature to distinguish between Cooperia drummondii (1-1/4" to 7") and Cooperia pedunculata (7/8" to 1-1/2")
What's the name for the white parts of this flower (hint: the perianth is not differentiated into calyx and corolla)?  

fruit a trilocular capsule