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Stackhousia (family Stackhousiaceae) A genus of annual or perennial herbs with simple, alternate leaves, which often show xerophytic features (e.g. succulent leaves). The regular, bisexual flowers are held in clusters, or racemes, or are solitary, and are composed of a united, 5-lobed calyx and a partly fused corolla with the narrow or broad petals united only in the centre. The fruit is a schizocarp which splits into 1-seeded segments along the locule partitions. The large seeds contain a fleshy endosperm. There are 26 species (25 endemic (see ENDEMISM) to Australia and New Zealand); the other is found in Malesia and Micronesia.