The taxonomy on this group appears to be very unsettled. This plant was/is known as "Cooperia drummondii" (USDA) and "Cooperia chlorosolen" (BONAP), while ITIS.gov now goes with Zephranthes.
No foliage visible. Single blossom.
Another rain lily "problem"?
Small white flowered planta to 25 cm tall with large white flowers to 4 cm in diameter. Growing in open area above El Platanar, Estado de México
Flowers open for just a few days, wta
Received >3 inches rain yesterday on already saturated soil.