DEVELOPMENT OF PLANTS 



411 



odors and glands that are developed in some of the forms indicate 

 that these plants are pollinated by insects. The flowers are 

 arranged upon a fleshy axis, the spadix, and in the simplest forms 

 are quite comparable to those of Typha, consisting of one or 

 a few stamens or a single pistil (Fig. 286, B-D). These im- 



FIG. 286. Inflorescence of the Arales: A, habit of the jack-in-the-pulpit. 

 B, diagram of the inflorescence with spathe, s, opened on one side to show 

 the spadix, sp, bearing staminate flowers at the base. C, a pistillate flower 

 consisting of a single naked carpel. D, a staminate flower of four two-lobed 

 anthers. E, section of the inflorescence of one of the arums p, compart- 

 ment containing pistillate flowers; s, staminate flowers. 



perfect flowers may be developed on different parts of the same 

 spadix or on different spadices. In more advanced types, the 

 flowers are perfect, containing one or several pistils that may be 

 united and stamens which are surrounded by a very rudimentary 



