Report of the Botanist. 



107 



22. Peridia mostly in series ; on both sides of the 



leaf Iridis 



22. Peridia not in series ; on the under side of the 



leaf 23 



23. Spots large and generally confluent ... 24 



24. Peridia crowded Podophylli 



24. Peridia not crowded, irregular placed, Erigekonatum 

 23. Spots small or medium, generally dis- 

 tinct 25 



25. Peridia central 26 



26. Crowded, leaf not pustulate on the 



opposite side Helianthi 



26. Loosely placed, leaf distinctly pustulate 



on the opposite side , tenue 



25. Peridia extending to the margin '. . . 27 



27. Peridia distinctly lobed on the margin, Mari^-Wilsoni 

 27. Peridia indistinctly lobed, mostly seri- 

 ated along the mid-rib Osmorrhiz^ 



27. Peridia indistinctly lobed, not seriated, Orobi 

 21. Spots more or less stained with pur- 

 ple or red 28 



28. Spots large, pustulate, the center purple or 



brown Impatientis 



28. Spots medium or small, scarcely pustulate ... 29 



29. Centrally red or purplish 30 



30. Mostly on the margin of the leaf or of its lobes, Geranh 



30. On any part of the leaf 31 



31. Peridia crowded, extending to the mar- 

 gin Grossularije 



31. Peridia central, few, mostly less than 



twenty Compositarum 



31. Peridia central, many, mostly more 



than twenty Penstemonis 



29. With a red dash extending from the spot 

 to the margin of the leaf; peridia 

 numerous, crowded CEnother^ 



Some of the foregoing species are variable and will not in all 

 cases rigidly agree with the characters here given, but a few 

 explanations and a list of the plants on which the species are 

 found, will remove nearly or quite all difficulties in tracing them. 



^cidium Bei^heridis sometimes has short peridia. I have seen 

 but a single dried specimen of j^. Clematitis which is on a thick- 

 ened petiole or stem. The color of the spot is taken from the 

 description. I have seen but few poor specimens of ^. Orohi, 

 and am not quite sure that they are rightly referred. ^. Imjpa- 

 tientis sometimes has the spots entirely yellow, and the same is 

 true of ^, Geranii and ^. Comjpositarum, JE. Geranii also 

 rarely has a purplish or yellow dash extending to the margin of 

 the leaf. 



