Table 1.

Leaf parameters and flower diameter of Impatiens New Guinea grown under two CO₂ concentrations: ambient CO₂ (380 μmol·mol⁻¹) and elevated CO₂ (760 μmol·mol⁻¹).

	Ambient CO2 (380 μmol·mol−1)	Elevated CO2 (760 μmol·mol−1)	% increase	P value
Log leaf length	0.863 ± 0.004	0.893 ± 0.004	3.5	<0.001
Log leaf width	0.392 ± 0.003	0.401 ± 0.003	2.3	0.009
Relative leaf area (cm2)	9.016 ± 0.137	9.864 ± 0.140	9.4	<0.001
Flower diameter (cm)	6.615 ± 0.028	6.656 ± 0.023	0.6	0.131

Values given are mean ± standard deviation. Mean values (n = 34 samples, with 9 leaves or flowers from 3 plants per sample) were compared by Student's t-test.