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

Fig. 4.

Fig. 4.

Onset and early development of vein orders in paradermal sections and clearings of leaves of C4 Flaveria bidentis. (A) Basal portion of young leaf showing central 1° vein procambium (0·5 mm). (B) Young leaf showing central 1° vein procambium (1 mm). (C) Mid-portion of leaf from central 1° vein to margin with lateral 1° vein procambium (1 mm). (D) Basal portion of leaf with lateral 1° vein procambium (3 mm). (E) Mid-portion of leaf with lateral 1° and 2° vein procambium (2 mm). (F) Leaf showing onset of 2° vein procambium (1 mm). (G) Connection of 2° vein loops (1 mm). (H) Appearance of 3° vein mesh (2 mm). (I) Developing 3° vein procambium within a 2° vein loop (2 mm). (J) 4° minor veins branching from 3° veins in basal portion of leaf (4·5 mm). (K) Serial section of leaf in J showing 5° minor veins. (L) Mid-portion of leaf with minor vein procambium (4·5 mm). (M) Mid-portion of the leaf with developing minor vein reticulum (7 mm). (N) Appearance of freely ending veinlets connected to minor veins in mid-portion of leaf (5 mm). (O) Mid-portion of leaf with freely ending veinlets compared with connected minor veins (7 mm). Abbreviations: C1, central 1° vein; L1, lateral 1° vein. Scale bars: all images = 100 µm, except (O) = 50 µm.