Nature and development of plants . Fig. 295. Fig. 294. Leaf of white birch, the blade, b, traversed by a network ofveins that end in free branches (the margin irregularly toothed or dentate)and supported upon a petiole, p. Fig. 295. Diagram of a cross-section of a stem of black oak four yearsold: p, pith; 1, 2, 3, 4, annual rings of xylem; c, cambium zone; ph,phloem; c, cortex; ck, cork; m, medullary rays. of the flower will also be noted. The majority of the orders ofthe dicotyledons, however, are characterized by perfect, cyclicflowers and the various sets of organs usually consist of four o
Nature and development of plants . Fig. 295. Fig. 294. Leaf of white birch, the blade, b, traversed by a network ofveins that end in free branches (the margin irregularly toothed or dentate)and supported upon a petiole, p. Fig. 295. Diagram of a cross-section of a stem of black oak four yearsold: p, pith; 1, 2, 3, 4, annual rings of xylem; c, cambium zone; ph,phloem; c, cortex; ck, cork; m, medullary rays. of the flower will also be noted. The majority of the orders ofthe dicotyledons, however, are characterized by perfect, cyclicflowers and the various sets of organs usually consist of four orfive members each. The perianth, when present, is generallydifferentiated into a green calyx and a variously colored stamens are more frequently arranged in one or two whorls,equalling or twice the number of the sepals, and the pistils usuallyform a single whorl, equalling or less than the number of crowding of the various organs, and the lateral growth ofthe receptacle results in the reduction in the numbe
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