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. 2009 Sep 16;104(6):1085–1098. doi: 10.1093/aob/mcp210

Fig. 5.

Fig. 5.

Early xylem differentiation in hierarchical vein orders in clearings of C3 and C4 Flaveria leaves. (A) Distal half of young leaf showing the central 1° vein and 2° vein loops in C3 F. robusta (3 mm). (B) Distal half of young leaf between central 1° vein and the leaf margin showing a lateral 1° vein and 2° vein loops in C4 F. bidentis (3 mm). (C) Discontinuous xylem differentiation of a lateral 1° vein in C3 F. robusta (6 mm). (D) Discontinuous xylem differentiation of a lateral 1° vein in C4 F. bidentis (4 mm). (E) Basipetal xylem differentiation of 2° veins in C3 F. robusta (2 mm). (F) Basipetal xylem differentiation of 2° veins in C4 F. bidentis (2 mm). (G) Basipetal xylem differentiation of 3° veins in C3 F. robusta (7 mm). (H) Basipetal xylem differentiation of 3° veins in C4 F. bidentis (5 mm). (I) Minor vein network in C3 F. robusta. (J) Minor vein network in C4 F. bidentis. (K) Freely ending veinlet ending in enlarged cells in C3 F. robusta. Arrow indicates tracheary element with helical thickenings. (L) Procambial-shaped cells joining a FEV to a mature higher order vein in C3 F. robusta. Abbreviations: C1, central 1° vein; L1, lateral 1° vein. Scale bars: all images = 100 µm.