Annunciation lily n. (Bot.) The common white lily (Lilium candidum). So called because it is usually introduced by painters in pictures of the Annunciation.
... L. candidum (Annunciation lily). White; 3 to 4 feet high; it makes an autumn growth, and should, therefore, be planted in August; set the bulbs from 4 ... — Manual of Gardening (Second Edition) • L. H. Bailey
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