Monotropaceae with Reference to Ericaceae 93 



In P. aphylla, there are five obovate petals, 6-8 mm. in length, 

 whitish or tinged with brown or green on the outside. 



In Moneses uniflora, the petals are five, occasionally six, 

 concave, orbicular, white or pinkish, about 1 cm. in length, 

 with a fimbriolate margin that is only visible under the micro- 

 scope. 



In Monotropa hypopitys, there are 5-4 yellow petals (five in 

 the terminal flower, four in the lateral flowers). These are 

 about 1 cm. in length and are narrow with a saccate base. Al- 

 though the petals are not united, they are erect, with margins 

 meeting, so that the flower appears campanulate. They are 

 covered on the upper and lower surfaces with numerous simple, 

 unicellular hairs. 



In M . uniflora, there are five, occasionally six, white or pink- 

 ish petals that appear somewhat similar to those of M. hypopitys, 

 except that they are larger (1.5 cm. in length) and thinner in 

 texture, and only sparsely hairy on the inner surface, and en- 

 tirely glabrous on the outer surface. 



In Sarcodes sanguinea, the petals are five in number, united, 

 campanulate (1-1.5 cm. in length), the five lobes are broad, 

 rounded, and slightly spreading. No hairs are present on either 

 surface. 



In Pterospora andromedea, the corolla is urceolate, the five 

 petals are white in color and united. They are 7-8 mm. in 

 length, the lobes ovate to reniform, very short and recurved. 



In Pleuricospora fimbriolata, there are five separate, slightly 

 spreading, white petals, each narrowly oval, with a fimbriolate 

 margin. 



In Schweinitzia odorata, the corolla is pink in color. It is 

 campanulate, with five lobes, which are ovate, shorter than the 

 tube. The tube is 5-saccate at the base, as in Monotropa. 



In Allotropa virgata, petals are absent. 



In Newberrya congesta, the corolla is urceolate. The four 

 lobes are ovate, about one-third as long as the tube which is 

 pubescent within. 



In N. spicata, the corolla is oblong campanulate, the four 

 lobes oblong-ovate, about one-half as long as the tube which is 

 pubescent within. 



In Cheilotheca there are three erect, linear-oblong, yellow-red 

 petals, 2.5 cm. in length. 



