De Candolle an involucre, are entirely free from the ovary ; the 

 apparent calyx-tube that surrounds the latter being really the 

 base of the tube of the corolla. 



Pig. 1. Pistil and stamens, the ovary surrounded by the adnate base of the 

 corolla, and, beneath it, is the base of the calyx, — magnified. 



