. Elements of plant biology. Plant physiology. Fig. 6i.—A, ground plan of a flower (floral diagram) showing five free sepals (black), five alternating free petals, ten stamens in two alternating whorls of five each, and three free (apocarpous) carpels. B, cross-sections of syncarpous ovaries of three carpels each (a, b, c), showing different types of placentation: axiU (note correspondence of placentae with those of the carpels in A), free central (the infolded carpel walls have disappeared, leaving one central placental column), and parietal (carpels not infolded, margins joined to form place
. Elements of plant biology. Plant physiology. Fig. 6i.—A, ground plan of a flower (floral diagram) showing five free sepals (black), five alternating free petals, ten stamens in two alternating whorls of five each, and three free (apocarpous) carpels. B, cross-sections of syncarpous ovaries of three carpels each (a, b, c), showing different types of placentation: axiU (note correspondence of placentae with those of the carpels in A), free central (the infolded carpel walls have disappeared, leaving one central placental column), and parietal (carpels not infolded, margins joined to form placentae on inside of outer wall). flower they brush against the ripe anthers, and the pollen grains stick to their hairy bodies. On visiting another flower of the same species—and bees especially often keep to one kind of flower on one journey—^the insect may brush against the stigma and rub off the grains. The positions of the ripe anthers and ripe stigmas in the flower are generally such that this probably or even inevitably happens. The petals of insect-pollinated flowers are often large, brightly coloured and conspicuous, so that the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tansley, Arthur George, 1871-. London, George Allen & Unwin Ltd. ; New York, Dodd, Mead & Co
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantph, bookyear1922
