46 



OBJECT LESSONS IN BOTANY. 



cohering (united) by their edges. The Convolvulus (Figs. 

 128, 144), tlie Phlox (Fig. 126), the Pink-root (Fig. 127), 

 &c., show a similar cohesion (union) of their petals into a 

 tube more or less complete. 



Fig. 123. Pink : a, the five petals ; 

 6, the calyx, composed of five united 

 sepals , c, a bract ; (/, several bract- 

 lets. 



Fig. 124. Flower of Ttconia radicans 

 (the Trumpet-creeper) : c is the calyx, 

 composed of five united sepals ; ^, the 

 tube ; 5, the segments of the corolla or 

 the petals, forming the border. 



75. The calyx »with united sepals is called ononosejMloiis^ 

 and the corolla of united petals monojpetalous (from the Greek 

 raonos^ one), from the mistaken idea that this calyx consisted 

 of only one sepal, &c. Gamojpetaloiis and gmnosejxiloiis are 

 similar words, used in the same sense. Opposed to these 

 terms 2<xq jpolysejpaloiis 2iU(\. polypetaloiis {Greek jjolys, many). 



76. The gamosepalous calyx or gamopetalous corolla, al- 

 though composed of several pieces, is described as a single 

 organ, and its lower part, formed by the united claws, 

 whether long or short, is tlie tuhe (Fig. 124, t); the upper 



74. Describe the calyx of Pink ; corolla of Phlox. 



75. Meaning of the terms monopetalous, &c. ? 



70. Define the limb of a monopetalous corolla ; the tube ; the throat. 



