CHAPTER XLIV. 



DICOTYLEDONS (Continued). 



Order RosiflorjE. 



426. Lesson XI. — The rose-like flowers are an interesting 

 and important group. In all the members the receptacle (the 

 end of the stem which bears the parts of the flower) is an im- 

 portant part of the flower. It is most often widened, and 

 either cup-shaped or urn-shaped, or the centre is elevated. 

 The carpels are borne in the centre in the depression, or on the 

 elevated central part where the receptacle takes on this form. 

 The calyx, corolla, and the stamens are usually borne on the 

 margin of the widened receptacle, and where this is on the 

 margin of a cup-shaped 

 or urn-shaped recep- 

 tacle they are said to 

 be perigytions, that is, 

 around the gynoecium. 

 The calyx and corolla 

 are usually in fives. 

 There are three families, 

 as follows. 



427. The rose family 

 (rosaceae). — In this family there are five types, represented by 

 the following plants and illustrations: ist. In spiraea (fig. 225) 

 the receptacle is cup-shaped. There are five carpels, united at 

 the base, but free at the ends. 2d. In the strawberry the 

 receptacle is conic and bears the carpels (fig. 226). The conic 

 receptacle becomes the fleshy fruit, with the seeds in little pits 



265 



Fig. 225. 

 Perigynqus flower of spiraea (S. lanceolata). 

 Warming.) 



(From 



