COMPOSITAE (composite FAMILY) 



:577 



Teeth of leaves callous-tipped 

 Teeth of leaves not calloused 

 Permanently tomentose or hoary. 



Steins tall X 4 dm. or more); leaves denticulate 

 or dentate. 

 Stems leafy to the siunmit .... 



Steins subnaked above .... 



Stems lower (less than 4 dm.); at least the lower 

 leaves entire ...... 



Stems scapose, the -leaves mostly rosulate on the 

 crowns. 

 Leaves elliptic to linear-oblanceolate, mostly entire. 

 Leaves linear-spatulate ..... 



Leaves elliptic . , • , - 

 Leaves reniform, orbicular or obovate, toothed at 

 least at the apex . . . 

 Leaves, or some of them pinnate or piAnatifid. 

 Leaves more or less reduced upward. ' 



Stem and leaves more or less floccosie, tardily glabrate. 

 Basal leaves entire, white-tomentose . ■ 

 Basal leaves, at least some of them, toothed or pinnati- 

 fid. 

 Basal leaves only dentate or crenate. 



Plants more or less tufted ..... 



Plants usually solitary Xnot tufted) . _ . 

 Basal leaves, or some of them, more or less pinnatifid. 

 At least some of the tomentum persisting. 



Some of the basal leaves simple and serrate or, 

 if pinnate, the terminal lobe much the larg- 

 est ........ 



All of the basal leaves pinnately toothed . 

 All of the tomentum wanting at maturity 

 Stems and leaves glabrous, or slightly floccose when 

 young only. 

 R^s present. 



Heads several to many. 

 Leaves fleshyr-thickened. 



Basal leaves tapering gradually to the petiole, 

 variously toothed ..... 



Basal leaves abruptly contracted into the petiole, 

 some of them deeply toothed or pinnately- 

 lobed. 

 Upper leaves sessile by an enlarged base 

 Upper leaves not dilated at base . 

 Leaves thin . 

 Heads solitary (rarely two). 



Basal leaves cordate, oval, or obovate., 

 I Basal leaves larger than the others 



Basal leaves small and soon deciduous . 

 Basal leaves obovate to bblaiiceolate, never cor- 

 date. 

 Stem leaves closely pinnatifid 

 Stem leaves with few short broad pinnae 



Rays wanting 



Leaves equable in size and distribution. 



Leaves pinnately or bipinnately toothed . . 

 Leaves with few to many linear-filiform lobes. 

 Plants more or less permanently tomentose . 

 Plants glabrous or soon glabrate. 

 , Most of the leaves pinnately ^divided 

 Most of the leaves linear-entire 

 Annual, often a weed ' 



14. ,S._glaucescena. 

 17. S.'perplexus. 



18. S. atratus. 



19. S, altus. 



20. S. canus. 



21. S. werneriaefolius, 



22. S. perennans. 



23. S. petrpcaljLis. 



20. S. canus. 



24. S. Nclsonii. 



25. S. Fondleri.. 



26. S. plattensis. 

 25. S. Fendlferi. 

 ,27. S. uintahensis. 



28. S. Rydbergii. 



29. S. crocatus. - , 



30. S. cymbalarioides, 



27. S. ujhtahensis. , ,' 



31. S. subnudus. 



32. S.pseudaureus. 



33. S. longipetiolatus. , 



34. S. Balsamitae. 

 ■35. S. mutabilis. 

 36. S. discoideus; 



37. S. eremophilus. 



38. S. filifolius. 



39. S. Riddellii. 



40. S. spartioides. 



41. S. vulgaris. 



1. Senecio Bigelovii Gray, Pacif. R. R. Rep. 4: 111. 1857. Robust, 4-8 

 dm. high, leafy nearly to the racemiform or simply paniculate inflorescence, at 

 length glabrate : leaves elongated-oblong to lanceolate, denticulate or dentate, 

 acute or acuminate; the radical and lower cauline 1-2 dm. long, 'abrupt at 

 base and naked-petioled, op tapering into a winged petiole or partly clasping 

 base; the upper cauline lanceolate with partly clasping base: heads ray less, 

 nodding, in small plants few or solitary. S. contristatus Greene. PI. Baker. 

 3: 24. 1901; 5. cHoranite Greene, Pitt. 4: 118. 1900.— In the mountains' 6f 

 southern Coloradd, and in adjacent New Mexico and Arizona. ^ 



la. Senecio Bigelovii Hallii Gray, Proc. Phila. Acad. 67. 1863. Leavef? 

 almost all lanceolate, more or less woolly-pubescent, hairs articulated; cau- 

 line leaves all sessile or the lowest contracted into a winged petiole; heads 



