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The environmental control of flowering in some arctic-alpineCarexspecies has been studied in controlled environments.Carex nigra, C. brunnescens, C. atrata, C. norwegicaandC. serotinaall had a dual induction requirement for flowering. In all exceptC. nigraeither low temperature (12 °C or lower) or short days (SD) over a wider range of temperatures were needed for primary floral induction and inflorescence...
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