. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Often THE ABBAN6EMENT OF THE FLOWERS 191 the umbel is compound; that is, secondary umbels, or umbellets,are borne on the ends of the rays (as the pedicels of an umbel areoften called). The bracts which subtend the pedicels in the racemeand corymb become verticillate under the umbel, or form an in-volucre; and the umbellets may be pro-vided with involucels. A last years umbelof the carrot (Fig. 187) is seen to bear theremains of umbellets. 220. The inflorescence of thecommon arrow-leaf is seen
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Often THE ABBAN6EMENT OF THE FLOWERS 191 the umbel is compound; that is, secondary umbels, or umbellets,are borne on the ends of the rays (as the pedicels of an umbel areoften called). The bracts which subtend the pedicels in the racemeand corymb become verticillate under the umbel, or form an in-volucre; and the umbellets may be pro-vided with involucels. A last years umbelof the carrot (Fig. 187) is seen to bear theremains of umbellets. 220. The inflorescence of thecommon arrow-leaf is seen in It is somewhat corymbose,for the lowest flowers open axis elongates after flower-ing begins, so that the individ-ual clusters are widely inflorescence appeals to one,therefore, as a series of whorledclusters. In other words, whenthe parts of an inflorescenceare widely separated, particularlyby subsequent growth of the axis,the inflorescence is described interms of its parts, and not as awhole. Such a method of flow-ermg may be called a Fig. 188. Three-flowered whorls The arrow-leaf or sagittaria is inter-esting because the flowers (as also the parts of the perianth) arein threes, the significance of which may be suggested later. Thelower flowers are commonly pistillate and the upper ones staminate.
Size: 1051px × 2377px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
