Monotropaceae with Reference to Ericaceae 



101 



stigma. These tubes pass down through the stylar canals and 

 spread over the placental surfaces. They are most numerous 

 in M. uniflora. 



In practically all members of the Ericaceae there is at the 

 base of the ovary a circular or crenately lobed nectary. In 

 Chimaphila this is represented by a narrow collar-like rim. 

 It is absent entirely in P. rotundifolia, P. elliptica, P. minor, 

 Moneses uniflora, Pterospora, Pleuricospora. The disc or nectary 

 is not continuous in any others of the Pyrolaceae or Mono- 

 tropaceae, being represented by ten very small swellings in 

 P. secunda, P. chlorantha, P. aphylla, and Sar codes sanguinea; 

 and by ten slightly larger and down directed lobes in Allotropa, 

 Schweinitzia, Newberrya, and Monotropa. 



Fig. 10. Longitudinal section seed of Pyrola rotundifolia X 300. 

 E = embryo. 



The Fruit and Seed 



In the genus Chimaphila, the capsule is depressed-globose, 

 five-valved, splitting from the apex downward. The valves 

 are smooth along the edges. After the flower is pollinated, 

 the pedicel straightens up so that the fruit is erect. This is 

 true for the entire family. The seeds are small, numerous, and 



