CHAPTER XLII. 



DICOTYLEDONS CONCLUDED. 

 SYM PETALS. 



538. In the remaining families the corolla is gamopetalous, 

 that is, the petals are coherent into a more or less well-formed 

 tube, though they may be free at the end. For this reason they 

 are known as the sympetalce. 



Topic VIII: Dicotyledons with united petals, flower 

 parts in five whorls. 



BICORNES. 



539. The pyrola family (pyrolaceae). The shin-leaf or wintergreen (Py- 

 rola elliptica), not the aromatic wintergreen, 



is figured at 377. The oval or elliptical leaves 

 are clustered at the base. The flower scape 

 is 15-30 cm high and bears a raceme at the 

 summit. The flowers hang singly from the 

 axils of colorless bracts. The floral formula 

 is as follows : Ca5,Co5, A 10,05. The Indian- 

 pipe (monotropa) is also a member of the pyrola 

 family. 



540. Lesson XVI. The whortle- 

 berry family (vacciniaceae). The 

 common whortleberry, or huckleberry 

 (Gaylussacia resinosa), flowers in May 

 and June. The shrubs are from ^ocm 

 to i meter (1-3 feet) high, and are 

 much branched. The leaves are ovate, 

 and when young are more or less 

 clammy from numerous resinous dots, 

 from which the plant gets its specific 

 name (resinosa). The flowers are borne on separate shoots from 



283 



Fig. 377- 

 Pyroia elliptica. 



