Table 1 Morphometric assessments of expanded leaves of winter and summer (±SD, n = 36)

Leaf length (mm)

10.8 ± 3.1^a

23.4 ± 8.8^b

Leaf width (mm)

10.1 ± 2.5^a

21.7 ± 6.9^b

Leaf surface area (on each side) (mm²)

93.7 ± 6.7^a

408.6 ± 49.2^b

Leaf thickness (μm)

254.5 ± 25.6^a

190.1 ± 17.9^b

Relative volume percentage of leaf upper epidermis (leaf cross section)

12.8 ± 2.1^a

12.5 ± 1.4^a

Relative volume percentage of leaf palisade parenchyma (leaf cross section)

53.2 ± 9.3^a

52.9 ± 10.6^a

Relative volume percentage of spongy parenchyma (leaf cross section)

29.3 ± 4.7^a

23.3 ± 1.8^b

Relative volume percentage of leaf lower epidermis (leaf cross section)

5.8 ± 0.6^a

4.1 ± 0.7^b

Density of stomata on the upper leaf side (No mm⁻²)

*

*

Density of stomata on the lower leaf side (No mm⁻²)

564.4 ± 81.1^a

458.2 ± 66.3^b

Density of peltate glandular hairs on the upper leaf side (No mm⁻²)

3.5 ± 2.0^a

4.6 ± 1.4^b

Density of peltate glandular hairs on the lower leaf side (No mm⁻²)

4.8 ± 1.4^a

6.1 ± 1.4^b