Table 2.
Fruit anatomical and micromorphological characteristics of five Kitagawia species.
| Taxa | K. baicalensis | K. stepposa | K. komarovii | K. terebinthacea | K. praeruptora |
|---|---|---|---|---|---|
| Mericarps | Strongly compressed dorsally | Strongly compressed dorsally | Strongly compressed dorsally | Strongly compressed dorsally | Slightly compressed dorsally |
| Dorsal rib shape | Filiform, slightly prominent | Filiform, slightly prominent | Filiform, slightly prominent | Filiform, slightly prominent | Filiform, prominent |
| Marginal rib shape | Winged | Winged | Winged | Winged | Narrowly winged |
| Vallecular vittae | 1 | 1 | 1 | 1 | 3–4 |
| Commissural vittae | 2 | 2 | 2 | 2 | 6 |
| Endosperm | Slightly concave | Slightly concave | Flat | Flat | Flat |
| Layers of mesocarp cells | 1–2 | 1–2 | 1–2 | 1–2 | 3–5 |
| Mesocarp parenchyma | Lignified parenchyma with pitted walls | Lignified parenchyma with pitted walls | Lignified parenchyma with pitted walls | Lignified parenchyma with pitted walls | Lignified parenchyma with pitted walls |
| Average of marw/fw (%) | 42.3 | 48.8 | 44.6 | 50.3 | 39.8 |
| Average of cow/fw (%) | 96.4 | 94.0 | 95.4 | 94.1 | 85.2 |
| Cell borders (outer surface of fruits) | Inconspicuous | Inconspicuous | Inconspicuous | Inconspicuous | Inconspicuous |
| Fruit surfaces | Undulate | Rugate | Tuberculate | Undulate | Raised |
| Cuticular foldings | Striate and rugulate | Smooth and striate | Smooth and striate | Striate and rugulate | Rugulate and tuberculate |
| Epicuticular wax | Absent | Absent | Absent | Absent | Absent |
| Inner fruit structure | Parenchyma cells with pitted walls | Parenchyma cells with pitted walls | Parenchyma cells with pitted walls | Parenchyma cells with pitted walls | Parenchyma cells with pitted walls |
Note: marw/fw: the ratio of the total widths of both marginal ribs to the fruit width; cow/fw: the ratio of the commissure width to the fruit width.