18 Rydberg : Studies on the Rocky Mountain flora 



given as a synonym. The latter plant is a decidedly pubescent 

 plant and should be associated rather with A. villosa, but is taller 

 and its flowers turn deep purple in age. 



Under the variety pumiliim we find Agoseris Leontodon 

 Rydb. as a synonym. The latter was based on Macrorhynchiis 

 glaucus laciniatus D. C. Eaton. Dr. Gray included in his Troxi- 

 mon glaucum laciniatum a multitude of forms, in fact everything 

 of the A. glauca group with laciniate leaves. Macrorhynchus 

 glaiiciis laciniatus D. C. Eaton is not found east of Nevada. 

 It is related to Stylopappus laciniatus Nutt. 



Under Troximon aracJinoideum (Rydb.) A. Nels. are found the 

 following: "T. glaucum laciniatum in part (not T. laciniatum 

 Gray . . . ; Agoseris laciniata Greene; A. arachnoidea Rydb. 

 . . .)." The plant described by Professor Nelson is the same as 

 Stylopappus laciniatus Nutt. A duplicate of Nuttall's type is in 

 the old Torrey herbarium, and it is to be known as Agoseris 

 laciniata (Nutt.) Greene. If Troximon is used the name should 

 be T. laciniatum (Nutt.) A. Gray, although Dr. Gray described 

 under that name an entirely different plant from Nuttall's Stylo- 

 pappus laciniatus. The type of the latter did not have developed 

 fruit and both Nuttall and Gray thought that it was related to 

 Stylopappus grajidiflorus Nuttall, or Troximon grandiflorum A. 

 Gray. Its achenes are of the A. glauca type with short striate 

 beak. (See further below.) To use the name Troximon arachnoi- 

 deum for this plant was entirely out of place, for Agoseris arach- 

 noidea Rydberg is an entirely different plant of the A. aurantiaca 

 group, with long filiform, non-striate achene-beak, in age purple 

 flowers, and with densely pubescent leaves. Evidently Professor 

 Nelson did not know the plant. 



Under Troximon purpureum we find the following synonyms: 

 " Macrorhynchus purpureus A. Gray . . . \ T. gracilens A. Gray 

 ... \ A. Greenei Rydb. as to our range." In the herbarium of 

 Columbia University there is a duplicate of the type of Macro- 

 rhynchus purpureus A. Gray. It is a low plant scarcely more than 

 I dm. high, with narrow, pinnatifid, glaucous and glabrous leaves 

 and brightly spotted involucral bracts. Professor Nelson char- 

 acterizes his Troximon purpureum as being tall, 2-5 dm. high, 

 with leaves tapering into long, slender, winged petioles. Evi- 



