. Botany for young people and common schools : how plants grow, a simple introduction to structural botany : with a popular flora, or an arrangement and description of common plants both wild and cultivated : illustrated by 500 wood engravings . Botany. FLOWERS : THEIR ARRANGEMENT ON THE STEM. 61 143 shows the plan of it. It is plainly the same as a raceme with the lower pedicels much longer than the uppermost. Shorten the body, or axis, of a corymb so that it is hardly perceptible, and we change it into 178. An Uml)cl, as in Fig. 144. This is a cluster in which the pedicels all spring from ab
. Botany for young people and common schools : how plants grow, a simple introduction to structural botany : with a popular flora, or an arrangement and description of common plants both wild and cultivated : illustrated by 500 wood engravings . Botany. FLOWERS : THEIR ARRANGEMENT ON THE STEM. 61 143 shows the plan of it. It is plainly the same as a raceme with the lower pedicels much longer than the uppermost. Shorten the body, or axis, of a corymb so that it is hardly perceptible, and we change it into 178. An Uml)cl, as in Fig. 144. This is a cluster in which the pedicels all spring from about the same level, like the rays or sticks of an umbrella, from which it takes its name. The Milkweed and Primrose bear their flowers in umbels. 179. The outer blossoms of a corymb or an umbel plainly answer to the lower blos- soms of a raceme. So the umbel and the coiymb blossom from the circumference towards the centre, the outer flower-buds being the oldest. By that we may know such clusters from cymes. 180. A Head is a flower- cluster with a very short body, or axis, and without any pedi- cels to the blossoms, or hardly any, so that it has a rounded form. The Button-bush (Fig. 145), the Thistle, and the Red Clover are good examples. 181. It is plain that an umbel would be changed into a head by shortening its pedicels down to nothing; or, contrarily, that a head would become an umbel by giving stalks to its flowers. 182. A Spike is a lengthened flower-cluster, with no pedicels to the flowers, or hardly any. Fig. 141 gives the plan of a spike; and the common Mullein and the Plantain are good examples. A head would become a spike by lengthening its axis. A ra- ceme would become a spike by shortening its pedicels so much that they could hardly be seen. The Catkin and the Spadix are only sorts of spike. 183. A Catkin or Ament is a spike with scaly bracts. The flowers of the Wil- low, Poplar, Alder, and Birch (Fig. 146) are in Please note that these images are extract
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectbotany, bookyear1864
