SECTION 8.] MODIFICATIONS OF THE TYPE. 



89 



Gamopetalous, said of a corolla the petals of which are thus coalescent 

 into one body, whether only at base or higher. The union may extend to 

 the very summit, as in Morning Glory and 

 the like (Fig. 247), so that the number of 

 petals hi it may not be apparent. The old 

 name for this was Monopetalous, but that 

 means " oue-petalled ; " while gamopetalous 

 means " petals united," and therefore is the 

 proper term. 



Polypetalous is the counterpart term, to 

 denote a corolla of distinct, that is, separate 

 petals. As it means " many petalled/' it is 

 not the best possible name, but it is the old 

 one and in almost universal use. 



Gamosepalous applies to the calyx when 

 the sepals are in this way united. 



Polysepalous, to the calyx when of sepa- 

 rate sepals or calyx-leaves. 



258. Degree of union or of separation in 

 descriptive botany is expressed in the same 

 way as is the lobing of leaves (139). See 

 Fig. 249-253, and the explanations. 



259. A corolla when gamopetalous com- 

 monly shows a distinction (well marked in 

 Fig. 249-251) between a contracted tubular 

 portion below, the TUBE, and the spread- 

 ing part above, the BORDER or LIMB. The 

 junction between tube and limb, or a more 

 or less enlarged upper portion of the tube 

 between the two, is the THROAT. The 

 same is true of the calyx. 



260. Some names are given to partic- 

 ular forms of the gamopetalous corolla, 

 applicable also to a gamosepalous calyx, 

 such as 



Wheel-shaped, or Rotate; when spread- 

 ing out at once, without a tube or with 

 a very short one, something in the shape 

 of a wheel or of its diverging spokes, Fig. 

 252, 253. 



Salver-shaped, or Salver-form ; when a flat-spreading border is raised on 



FIG. 246. Flower of Datura Stramonium ; gamosepalous and gamopetalous. 

 FIG. 247. Funnelform corolla of a common Morning Glory, detached from its 

 polysepalous calyx. 



