Onagraceae: The Onagraceae (or Oenotheraceae) family is a family of dicotyledonous plants which includes 640 species in about twenty genera. They are shrubs (sometimes trees) and annual, biennial or perennial herbaceous plants, sometimes aquatic, from cold to tropical regions. The flowers are hermaphroditic, regular or almost regular. The calyx is formed of 4, rarely 2 or 5, deciduous or persistent divisions and united at their bases in a calicine tube ...
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