88 Henderson — Comparative Study of Pyrolaceae and 



In P. elliptica, the flowerstalk is 1-2 dm. in length with 0-2 

 scales; the raceme is 6-15-flowered; the bracts are linear-lanceo- 

 late, 5-6 mm. long, about equal in length to the smooth pedicels. 

 The margin of the bracts is entire. 



In P. secunda, the flowerstalk is 1-2 dm. in length, with 1-4 

 scales. The flowers, 6-17 in number, are arranged in a raceme 

 with the flowers all turned to one side. The bracts are subulate- 

 ovate, slightly shorter than the pubescent pedicels, which are 

 4-5 mm. in length. 



In P. minor, the flowerstalk is 0.5-2 dm. in length with one 

 or two scales; there are 5-17 flowers borne in a raceme, each 

 on a pedicel equal in length to the 2-3-mm. subulate bracts. 



In P. chlorantha, the flowerstalk is 0.5-2 dm. in length, with 

 a single scale. There are 2-8 flowers borne in a raceme. The 

 bracts are lanceolate, 4 mm. long, shorter than the pedicels, 

 which are 5-6 mm. in length. 



In P. aphylla, the flowerstalk is 1-3 dm. in length, with 

 numerous scales extending from the base upward. There are 

 8-25 flowers borne in a raceme, each on a recurved pedicel about 

 5 mm. in length. The bracts are lanceolate, 3-5 mm. in length. 



In Moneses uniflora, the flowerstalk bears one flower and is 

 0.5-1.3 dm. in length with one scale, similar in form to the one 

 bract. This is ovate, about 4 mm. in length, and, under the 

 microscope, is seen to have numerous unicellular hairs along 

 the margin. The margin becomes slightly fimbriolate toward 

 the apex. 



In all members of the Monotropaceae examined, green leaves 

 are not produced, their place being taken by scales which grad- 

 ually pass with little change of structure into bracts subtending 

 the flowers. 



In Monotropa hypopitys, the flowerstalk — in this case the 

 entire ascending axis — is 1-3 dm. tall. The flowers are numer- 

 ous, 3-15, each borne on a pubescent pedicel that is 3 mm. in 

 length. The bracts are narrow ovate, yellow, 10-12 mm. in 

 length, shorter than the flower. The outer surface and the 

 margin of these bracts are covered with unicellular hairs. 

 Toward the apex, the margin becomes somewhat irregularly 

 toothed. 



In M. uniflora, there is one flower produced at the end of 

 the 0.5-1. 5-dm. -tall flowerstalk. The bracts, white in color, 



