As Agapanthus africanus (L.) Hoffmanns. 1824, commonly called Lily of the Nile, African Lily or Blue Agapanthus is a member of the Amaryllis family (Amaryllidaceae), it`s not a lily (lily family (Liliaceae).
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Image: Lily of the Nile (Agapanthus africanus)
Plants of the Amaryllis family (Amaryllidaceae) at Orchids Flowers.com: