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''Cooperia'' was a genus of tender herbaceous perennials native to 
Ladybird Johnson Wildflower Center Native Plant Information Network entryUSDA PLANTS entry
{{Taxonbar, from=Q2996595 Amaryllidoideae Night-blooming plants Flora of Texas Amaryllidaceae genera Historically recognized angiosperm genera
South America
South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ...
and the southern reaches of North America. Along with the former genus ''Habranthus'', ''Cooperia'' is now included in a more broadly circumscribed
In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius.
Not every polyg ...
genus ''Zephyranthes
''Zephyranthes'' is a genus of temperate and tropical plants in the Amaryllis family, subfamily Amaryllidoideae, native to the Western Hemisphere and widely cultivated as ornamentals. Following the expansion of the genus in 2019, which n ...
'', a member of the amaryllis family, Amaryllidaceae. All three genera were commonly known as rain lilies because of their propensity for blooming after rain
Rain is water droplets that have condensed from atmospheric water vapor and then fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides water ...
s. Species formerly placed in ''Cooperia'' bloom in summer and fall.
Although ''Cooperia'' was considered distinguishable from the better known rain lily genus, ''Zephyranthes'', by its fragrance similar to primroses, its white or yellow pollen, its tolerance for drout and desert conditions (Howard 2001:54) and tendency to be night-blooming (Ogden 1994:11), it is now considered to be part of ''Zephyranthes'' and the genus name ''Cooperia'' is no longer accepted.
Cultivation
Hybrids have been successfully created with species then placed in separate genera ''Zephyranthes'' (× ''Cooperanthes'') and ''Habranthus'' (× ''Cooperanthus'') (Ogden 1994:11, Howard 2001:54). All are now within ''Zephyranthes''.See also
*List of plants known as lily Lily usually refers to herbaceous plants of the genus ''Lilium'', with large showy trumpet-shaped flowers. Many species are cultivated as ornamentals.
Many other plants not closely related to lilies are called lilies, usually because their flowers ...
References
Bibliography
* Fellers, John D. "A Passion for Rainlilies: Cooperia, Habranthus, and Zephyranthes." ''Herbertia'' v51, 1996, pp 78–112. * Howard, Thad M. ''Bulbs for Warm Climates''. Austin, TX: University of Texas Press, 2001, pp 53; 54-56. * Ogden, Scott. ''Garden Bulbs for the South''. Dallas, TX: Taylor Publishing Co., 1994, pp 5–27. * *External links
Ladybird Johnson Wildflower Center Native Plant Information Network entry
{{Taxonbar, from=Q2996595 Amaryllidoideae Night-blooming plants Flora of Texas Amaryllidaceae genera Historically recognized angiosperm genera