Flowering time of ephemeral plant species in Namaqualand (South Africa) generally ranges from mid-July through September, depending on the timing of the first substantial winter rains. The precise timing of the flowering of species is determined by the individual's life history and the integrated effects of a complex of environmental factors. Phenological and climatic data were recorded and used to determine the number of thermal units required by four Namaqualand ephemeral species to reach a certain phenological stage.
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