Figure 4.

Diversity of intraspecific anatomical components. Histograms of (a) vein density (i.e., the total number of veins per segment) and (b) the number of major veins per segment in C₄ (red; n = 72) and non‐C₄ (grey, n = 69) accessions. Scatter plots show (c) the average number of mesophyll (M) cells between major veins vs. the average area of individual bundle sheath (BS) cells, with dot size proportional to the M:BS ratio, and (d) BS cell area vs. outer sheath cell area, with dot size proportional to the number of veins per segment. Colours indicate photosynthetic type with C₃ (blue; n = 17), C₃‐C₄ (green; n = 6) and C₄ (red; n = 27).