Fig. 7.

Light micrographs showing cross-sections of cotyledons (A, D, G, J, M, P) and young stems (B, E, H, K, N, Q), and scanning electron microscopy of stem epidermis (C, F, I, L, O, R) for six Portulaca species: P. umbraticola (A–C), P. oleracea (D–F), P. grandiflora (G–I), P. amilis (J–L), P. cf. bicolor (M–O), and P. cryptopetala (P–R). CP, cortex parenchyma; H, hypoderm; VB, vascular bundle. Scale bars: 200 μm for cotyledons (left column); 100 μm for stem cross-sections (middle column); 500 μm for C, F, I, L, R, and 400 μm for O for stem epidermis (right column).