466 RvDBERG : Rocky Mountain flora 



has narrower divisions to the stem-leaves, and has hispidulous 

 instead of glabrous achenes. 



Under Senecio cymhalarioides Nutt., in the New Manual is 

 given the following: "(5. Jonesii, S. suhciineatus, S. acutidens 

 Rydb. * * * and S. oodes Rydb. * * * seem to be impossible 

 to discriminate satisfactorily)." S. suhciineatus and 5. acutidens, 

 especially the latter, are closely related to S. cymhalarioides, but 

 the others are not. S. Jonesii is more closely related to 5. uin- 

 tahensis than to S. cymhalarioides and is perhaps not specifically 

 distinct. If not, S. Jonesii is the older name and should be used. 



Senecio Hartianus Heller is given as a synonym of S. pseu- 

 daureus Rydb. Professor Nelson may have been led astray by 

 myself, for the specimens referred to 5. Hartianus in my Flora 

 of Colorado are but depauperate specimens of S. pseudaiireus. 

 The true 5. Hartianus is closely related to 5. flavulus Greene. 



Senecio pyrrochrons Greene and 5. Tracyi Rydb. are made syno- 

 nyms of 5. longipetiolatus Rydb. They are both more related to 

 S. pseudaureus, having cordate or reniform, although entire, basal 

 leaves, while in S. longipetiolatus the basal leaves are narrow and 

 oblanceolate, tapering into the petioles. 



Senecio fediifolius Rydb. and S. nephrophyllus Rydb. are made 

 synonyms of S. discoideus (Hook.) Britton, perhaps because all 

 three have usually discoid heads. The original descriptions show 

 that they are entirely different plants. S. discoideus should be 

 replaced by S. paucifiorus Pursh, which is an older name. Green- 

 man and Blankinship* think that 5. nephrophyllus is the same as 

 S. dehilis Nutt. I have not seen the type of the latter and can 

 not express any opinion. 



Dr. Greenman some years ago called my attention to the fact 

 that the plant usually known as Senecio eremophilus Richardson, 

 does not agree with the original. There is a duplicate of the latter 

 in the Columbia University herbarium and it differs from the 

 Colorado plant in the larger heads, which are 10-12 mm. high 

 and about i cm. wide and ascending or spreading instead of erect. 

 In the Colorado plant the heads are less than i cm. high. 5. ere- 

 mophilus is a northern plant, its range extending from Manitoba to 



*See Supplement to the Flora of Montana 102. 



