Nature and development of plants . A simple type of the Chenopodiales: A, shoot of Mexican tea(Chaiopodiiim), showing character of inflorescence, in. B, flower en-larged, showing the perianth, stamens and pistil of three cohering carpels. are associated with it. In the higher members of the order, asin the purslane and pink families (which includes the springbeauty, Claytonia), the perianth becomes differentiated into acalyx and showy corolla, and the flowers have become in amarked degree adapted to insect visitors (Fig. 304). Theseorders form a natural transition from the primitive flowers of
Nature and development of plants . A simple type of the Chenopodiales: A, shoot of Mexican tea(Chaiopodiiim), showing character of inflorescence, in. B, flower en-larged, showing the perianth, stamens and pistil of three cohering carpels. are associated with it. In the higher members of the order, asin the purslane and pink families (which includes the springbeauty, Claytonia), the perianth becomes differentiated into acalyx and showy corolla, and the flowers have become in amarked degree adapted to insect visitors (Fig. 304). Theseorders form a natural transition from the primitive flowers ofthe willows and beeches to the large flowers of the next orderwith their showy perianths, though the structure of the flowerdoes not indicate a relationship between them. 142. Ranales, the Buttercup or Crowfoot Order.—This large DEVELOPMENT OF PLANTS 405 and interesting order includes a great variety of our commonplants, herbs and trees, as the white and yellow water lilies{Nymphaea and Castalia), buttercups (Ranunculus), marsh. Fig. 304. Advanced type of the Chenopodiales: A, shoot of Mclandry-num bearing flower with perianth differntiated into calyx, ca, and corolla,c. B, section of flower, showing the relation of calyx to corolla andthe concealment of the nectar glands at the base of the ovary. Access tothe corolla tube is guarded by an outgrowth on the petals, as shown in C,which, assisted by the styles or stamens, so effectually closes the mouth ofthe tube that only insects with long tongues can reach the honey. marigold (Caltha), windflower (Anemone), Hepatica, rue(Thalictrum), columbine (Aquilegia), larkspur (Delphinium),monkshood (Aconitum), may apple (Podophyllum), magno-lia, tulip tree (Liriodendron), Sassafras, spice bush (Benzoin),etc. In this order we have again reached the point, just as inthe monocotyledons (see Liliales), where the flowers are moreusually solitary and conspicuous, owing to the development oflarge, showy perianths that are more frequently diffe
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