Rvdberg : Studies on the Rocky Mountain flora 13 



at least it is more closely related to it than is C. denticulata Rydb., 

 which Professor Nelson reduces to a variety. A "conservative" 

 botanist would unite C. platyphylla Greene ( C. runcinata hispi- 



9 



dulosa Howell) and C. riparia. The latter would then be reduced 

 to Fynonymy, as the form' r name is three years older In Torrey 

 and Gray's Flora, Hieracium runcinatum was transferred to Crepis 

 and the authors cite four specimens, of which two, viz., those 

 collected by Drummond ( Crepis biennis fi Hook.*) and by Nicollet 

 are preserved in the Torrey herbarium. These agree with the 

 description of Torrey 's Hieracium runcinatum. I have adopted 

 the name Crepis runcinata for these specimens rather than to 

 transfer the name to C. riparia. If Professor Nelson had reduced 

 C. tomentulosa to a synonym of C. glauca, I would have made no 

 objection, for I myself am somewhat suspicious that it may be 

 on'y a state or condition of that species. Crepis petiolata and 

 C. glauc lla are closely related to it, and the glandular involucre 

 is the only character which would associate it with C. runcinata. 

 C. perplexans is closer to C. runcinata, but it also is a glabrous 

 plant. 



Both Crepis denticulata Rydb. and C. alpicola A. Nels. are 

 included in C. riparia parva A. Nels. Crepis alpicola was tech- 

 nically based on C. runcinata alpicola Rydb. The type of both 

 the latter and C. denticulata are in the herbarium of the New York 

 Botanical Garden and they are not at all alike. Nelson's de- 

 scription of C. riparia parva agrees with C. alpicola but not with 

 C. denticulata. Compare the original descriptions. 



Crepis angustata Rydb. is made a synonym of C. gracilis 

 (D. C. Eaton) Rydb. The plant described by Professor Nelson 

 is, however, not C. gracilis but C. angustata. Crepis gracilis was 

 established on C. occidentalis gracilis D. C. Eaton. f The type 

 of this is Watson 716, a duplicate of which is in the Columbia 

 University herbarium. It is a plant exceedingly like C. scopu- 

 lorum in habit, but the involucre is narrower, the bracts fewer, 

 and the achenes distinctly ribbed. Some of the involucral bracts 

 have a few black hairs as they have in C. scopulorum. Crepis 

 angustata, like C. intermedia, never has black hairs. C. gracilis 



*F1. Bor.-Am. i: 297. 



fBot. King. Exp. 203. 1871. 



