442 



THE POLEMONIALES 



are attached, one from each of the two adjoining anthers, to a 

 peculiar hook, so that the leg of the insect becomes caught in 

 the hook and withdraws the pollinia in pairs. 



152. Polemoniales, or Phlox Order. This group is the richest 

 in the number of species, over 14,600, of any order of angio- 

 sperms. The advance over previous orders is seen in the more 

 complete adhesion of corolla and stamens, the filaments appear- 

 ing to arise at a higher point on the corolla (Fig. 330, D) and 



D 



FIG. 329. FIG. 330. 



FIG. 329. Flower of the morning-glory (Ipomoea'}, showing the tubular 

 corolla characteristic of the Polemoniales. 



FIG. 330. Boraginaceae : C, inflorescence of comfrey (Symphytum}. 

 Note the coiled inflorescence, a, a feature of this family. D, section of 

 flower, showing the deeply four-lobed ovary and the stamens cohering high 

 on the corolla and alternating with small tongue-like scales. 



the stamens are reduced to a single whorl, and frequently less 

 than five in number. The pistils cohere completely and are 

 usually composed of but two carpels. This reduction is asso- 

 ciated with a pronounced irregularity of the corolla in the higher 

 families and a high degree of specialization in the construction 

 of the flower which accounts for the occurrence of the large 

 number of individuals. The order is noted for its great number 



