442 



THE POLEMONIALES 



arc 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 



SyEL 



mr, m 



Fig. 329. Fig. 330. 



FlG. 329. Flower of the morning-glory (Ipomoca), 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 

 Oil tlie 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 



