Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . leaves are thus disposed on an infinite curve, and arenever brought into exactly straight ranks. Theothers are correspondingly termed rectiserial,because, as the divergence is an integral partof the circumference, the leaves are necessarilybrought into rectilineal ranks for the wholelength of the stem. 249. A different series of spirals sometimesoccurs in alternate leaves, viz. £, \, f, T3f; andstill others have been de
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . leaves are thus disposed on an infinite curve, and arenever brought into exactly straight ranks. Theothers are correspondingly termed rectiserial,because, as the divergence is an integral partof the circumference, the leaves are necessarilybrought into rectilineal ranks for the wholelength of the stem. 249. A different series of spirals sometimesoccurs in alternate leaves, viz. £, \, f, T3f; andstill others have been detected; but these arerare or exceptional cases. 250. Opposite Leaves (237, Fig. 210). In these, almost without exception, the second pair is placed over the intervals of the first, the third over the intervals of the second, and so on. More commonly, as in plants of the Labiate or Mint Family, the successive pairs cross each other exactly at right angles, so that the third pair stands directly over the first, the fourth 210 over the second, &c, forming four equidistant vertical ranks for the FIG. 210. Opposite leaves of the Strawberry-bush, or Euonymus 142 THE LEAVES.
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
