98 Henderson — Comparative Study of Pyrolaceae and 



In P. minor there are no nectaries at the base of the five- 

 lobed, incompletely 5-celled, ovary. The style is short, erect, 

 1 mm. in length, included in the petals. 



In P. chlorantha the ovary is five-lobed, with 10 small nec- 

 tariferous lobes at the base. The style is long, about 7 mm., 

 exserted a little beyond the corolla, thickened upwards and 

 declined as in P. rotundifolia and P. elliptica. 



In P. aphylla the ovary is five-lobed with ten small nectari- 

 ferous lobes at the base. The style is erect, short, 3 mm. in 

 length. 



In Moneses uniflora the ovary is ten-lobed. It is five-celled 

 for the most part because the deep insertion of the style limits 

 the region where the placentae fail to meet. No nectariferous 

 lobes are present. The style is erect, inserted rather deeply 

 into the ovary. It widens out toward the extremity forming 

 a rim that is wider than that of P. elliptica, and with a stigma 

 consisting of five fleshy lobes that are longer than in P. elliptica. 



Fig. 8. Transverse section ovary Pleuricospora fimbriolata X 25. 



1. Near base. 



2. At middle. 



In Monotropa hypopitys the ovary is ovoid, 10-8-lobed. As 

 in the Pyrolaceae it is 5-4-celled at the base and one-celled 

 above with 5-4 bilobed parietal placentae. At the base of the 

 ovary there are 10-8 downward directed spur-like processes, 

 which extend between the stamens and secrete nectar into the 

 saccate bases of the petals. The style is thick and fleshy, 

 longer than the ovary, it and the ovarian wall being strongly 

 pubescent with unicellular hairs. Toward the top, the style 



