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We determined the cold (freezing) tolerance of five Spanish populations of the perennial shrub Bituminaria bituminosa (L.) C.H. Stirton (Fabaceae), as the temperature at which 50 % of leaf electrolytes are released (LT50) using leaves of field-grown plants, obtained in two winters and one spring. The freezing tolerance was greater in winter and reflected the minimum temperatures at the original sites...
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