Abstract
Atriplex halimus, a monoecious species, produces flowers displaying two basic structures. A first structural pattern is made of pentamerous male flowers with perianth parts and stamens. The second structural pattern is represented by female flowers, limited to a single pistil enclosed in two opposite bracteoles. In both structures, however, unisexual flowers of the unexpected sex and hermaphroditic flowers have been detected. In the present work, new flowers, never found before in A. halimus, are described. Their structural pattern includes bracteoles and perianth segments, and they are either hermaphroditic or unixesual. These findings revealing the huge floral plasticity, suggest that the two flower structures normally occurring in A. halimus have derived from the same original flower morph through two pathways, implicating selective suppressions of flower parts.
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