RvDBERG : Studies ox Rocky Mountain Flora 175 



pactits. The description seems to indicate mostly this species, 

 which also I had in mind when I raised the variety to specific 

 rank and it is this that is described and figured in Britton and 

 Brown's Illustrated Flora. On the other hand if synonomy and 

 the citation of specimens are taken in consideration, the name may 

 have been applied to the next, for the first synonym and the first 

 specimen cited belong to that species. [Plate 5, f 15.] 



Nebraska : Valentine, /. M. Bates, j^ ; Lewellen, G. D. 

 SivcL'sey, 82 ; Fort Niobrara, 1888, T. E. Wilcox; Thedford, 

 1893, P. A. Rydbcrg, r^ii ; Platte Bottom, 1891, 211. 



Colorado: Plains, \Z^2, Allen & Brcivster ; Colorado Springs, 

 I ^g2, Isabel Mil I ford. 



7. Senecio tridenticulatus sp. nov. 

 Senccio aureus var. borealis A. Gray, PI. Wright, i : 125. 1852 ; 



not T. & G. 1843 ; S. aureus var. coinpactus A. Gray, Syn. Fl. 



I^: 391 ; in part. 



Perennial with a branched caudex, in age perfectly glabrous, 

 or slightly floccose at the base of the leaves : stems very slender, 

 about 3 dm. high : basal leaves very narrowly oblanceolate, thick 

 with a slender petiole, slightly 3-toothed at the apex or wholly 

 entire, 4-8 cm. long and 4-5 mm. wide : stem leaves linear and 

 subentire : cyme open and corymbiform : heads 7-8 mm. high : 

 bracts lanceolate, acute 73 or 3/ as long as the disk : rays light 

 yellow, about 8 mm. long and 1-1.5 mm. wide, 3-nerved ; achenes 

 hispid-puberulent on the angles. 



This species differs, from the preceding in the slender stem and 

 the open cyme, and also in the form of the leaves. The latter 

 character also separates it from the next following. It grows in 

 wet sandy soil. The type was growing at an altitude of 2400 m. 

 Wright's specimens are past blooming, and good characters could 

 not be taken from them, wherefore I have made Sheldon's speci- 

 mens the type. The latter were mixed with some of the next. 

 [Plate 5, f. 12.] 



Colorado : Cottonwood Creek, Buena Vista, 1892, C. S. Shel- 

 don (type in the herbarium of N. Y. Botanical Garden). 



Texas: Mountams beyond the Limpia, 1849, Wright, 40^. 



8. Senecio oblanceolatus sp. nov. 



Perennial with several stems from a strong root, in age glabrous 

 or rarely slightly floccose at the base of the leaves : stems short and 



