Nature and development of plants . se are the most important characteristics of the order. B,fringed gentian (Goitiaiia), showing leaf arrangement and twisting ofpetals in bud, b, characteristics of the order. C, section of flower. D,fruit, the two carpels separated. the gentians, marsh pink (Sabbatia), the aquatic floating heart(Liiiniaiithciiutiii) and the highly specialized plants of the dog-bane and milkweed families. The latter family is distinguishedby the microspores being united into club-shaped pollinia that 442 THE POLEMONIALES arc attached, one from each of the two adjoining anthers
Nature and development of plants . se are the most important characteristics of the order. B,fringed gentian (Goitiaiia), showing leaf arrangement and twisting ofpetals in bud, b, characteristics of the order. C, section of flower. D,fruit, the two carpels separated. the gentians, marsh pink (Sabbatia), the aquatic floating heart(Liiiniaiithciiutiii) and the highly specialized plants of the dog-bane and milkweed families. The latter family is distinguishedby the microspores being united into club-shaped pollinia that 442 THE POLEMONIALES arc attached, one from each of the two adjoining anthers, to apeculiar hook, so that the leg of the insect becomes caught inthe hook and withdraws the pollinia in pairs. 152. Polemoniales, or Phlox Order.—This group is the richestin the number of species, over 14,600, of any order of angio-sperms. The advance over previous orders is seen in the morecomplete adhesion of corolla and stamens, the filaments appear-ing to arise at a higher point on the corolla (Fig. 330, D) and SyEL mr, m.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectplants
