. Nature and development of plants. Botany. 462 THE MYRTALES and placed opposite the sepals, whereas they alternate with the sepals in the Sapindales (Fig. 331, E-G), and the nectary is within the filaments. 147. Myrtales, the Myrtle Order.—This order marks a decided advance in the evolution of the flower over preceding groups, owing to the mass growth of the calyx and receptacle and usually of the ovary, the flowers being perigynous and usually epigynous. Another important character is that the flowers are always cyclic, the organs being regularly arranged in five whorls of four or less. Fig.
. Nature and development of plants. Botany. 462 THE MYRTALES and placed opposite the sepals, whereas they alternate with the sepals in the Sapindales (Fig. 331, E-G), and the nectary is within the filaments. 147. Myrtales, the Myrtle Order.—This order marks a decided advance in the evolution of the flower over preceding groups, owing to the mass growth of the calyx and receptacle and usually of the ovary, the flowers being perigynous and usually epigynous. Another important character is that the flowers are always cyclic, the organs being regularly arranged in five whorls of four or less. Fig. 322. Lower form of the Myrtales, flower perigynous: A, flower of Lythrum. B, flower in section—c, lobe of the tubular calyx, from the margin of which arise the petals, p. This flower has the long form of style and the short and medium form of stamens. C, flower with medium style and with short and long stamens. D, flower with short style and with medium and long stamens. commonly of five members each, though the number of stamens may be greatly increased by the splitting of the original number of the set. The petals are frequently suppressed and the calyx is often highly colored, a variation to be seen in many groups when the corolla is wanting. The carpels, as a rule, contain numerous ovules (Figs. 322, 323). The Myrtales is an important tropical order and represented with us by many familiar plants, such as the meadow beauty (Rhexia). willow-herb (Epilobium), the large. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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