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Manual of Leaf Architecture: Morphological Description and by Smithsonian Leaf Architecture Group

By Smithsonian Leaf Architecture Group

Sixty seven pages.

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Additional info for Manual of Leaf Architecture: Morphological Description and Categorization of Dicotyledonous and Net-Veined Monocotyledonous Angiosperms

Example text

5 Fig. 6 decreasing exmedially - the angles of the tertiaries become more acute away from the axis of symmetry. increasing basally - the tertiary angles become more obtuse toward the base of the lamina. - 39 - 39. 4° VEIN CATEGORY Fourth and higher order venational characters should be scored in the portion of the leaf that is roughly half way between the base and the apex unless the area is lacking. Fagus engleriana (Fagaceae) Actinidia latifolia (Actinidiaceae) Fig. 1 Fig. 2 o opposite percurrent - 4os cross between adjacent 3os in parallel paths without branching.

1 teeth Mollinedia floribunda (Monimiaceae) Picramnia krukovic (Simaroubaceae) Fig. 2 no teeth Fig. 3 teeth incomplete loops - freely ending veinlets adjacent to the margin. Fig. 4 no teeth looped - marginal ultimate vein recurved to form loops. leaf margin leaf margin fimbrial vein fimbrial vein Pycnocoma littoralis (Euphorbiaceae) Cissampelos ciliafolia (Menispermaceae) Fig. 5 teeth Fig. 6 no teeth fimbrial vein - higher vein orders fused into a vein running just inside the margin. - 44 - 46.

6 2 or more branched branches more than once. 43. HIGHEST ORDER Highest vein order of the leaf. 44. HIGHEST EXCURRENT Highest vein order showing excurrent branching; that is, having true lateral branches rather than those produced by forking of the vein. - 43 - 45. MARGINAL ULTIMATE (VENATION) Eucryphia glandulosa (Eucryphiaceae) Carissa bispinosa (Apocynaceae) Fig. 1 teeth Mollinedia floribunda (Monimiaceae) Picramnia krukovic (Simaroubaceae) Fig. 2 no teeth Fig. 3 teeth incomplete loops - freely ending veinlets adjacent to the margin.

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