392 CARDUACEAE. 



XIII. TOMENTOSI. 



Basal leaves mostly dentate or crenate. ' 



Basal leaves obovate or spatttlate. 



Lower stem-leaves acute ; plant dark green. 32. S. plattensis. 



Lower stem-leaves obtuse; plant yellowish-green. 53. S\ flavulus. 

 Basal leaves lanceolate or oblanceolate. 



Basal leaves narrowly oblanceolate, serrate. 33. S. salicinus. 



Basal leaves lanceolate, sinuate-dentate. 34. 5\ canovirens. 



Some of the basal leaves entire or dentate, the rest pinnatifid or pinnately lobed. 

 Plant conspicuously rosulate-stoloniferous ; stem-leaves sinuately round-lobed. 



35. 5. rosulatus. 

 Plant not stoloniferous ; stem-leaves pinnatifid with toothed lobes. 



32. 5. plattensis. 

 All leaves pinnatifid with toothed segments. 



Caudex subligneous ; plant tomentose ; bracts shorter than the disk. 

 Leaves mostly flat and deeply pinnatifid. 36. 5". Fendleri. 



Leaves very crisp with short-rounded lobes. 37. 5\ lanatifolius. 



Caudex not subligneous ; plant glabrate. 38. 5. multilobatiis. 



XIV. AUREI. 



Basal leaves pinnatifid. 38. 5". multilobatus. 



Basal leaves not pinnatifid. 

 Heads radiate. 



Leaves thick, more or less fleshy. 

 Basal leaves narrowly oblanceolate. 



Plant low, less than 2 dm. high, often with several stems from the base ; 



basal leaves short-petioled. 

 Cyme dense ; upper leaves generally pinnatifid with narrow lobes. 



39. S. condensatus. 

 Cyme more open ; stem-leaves entire or merely crenate. 



Basal leaves subentire or 3-toothed at the apex. 



40. 5". tridenticulatus. 

 Basal leaves crenate. 41. S. oblanceolatus. 



Plant 3-6 dm. high ; basal leaves i dm. or more. 



42. S. longipetiolatus. 



Basal leaves cuneate, spatulate, broadly oblanceolate or orbicular, sub- 

 entire at the base. 

 Lower stem-leaves spatulate with a broad-winged petiole ; upper ones 



sessile and with much enlarged bases. 43. S. crocatus. 



Stem-leaves neither broad-winged nor with much enlarged bases. 

 All leaves large, broadly obovate, coarsely toothed. 



44. S. oodes. 

 Upper stem-leaves reduced, either pinnatifid or very narrow. 



Basal leaves crenate above the middle. 45. 6". cymbalarioides. 

 Basal leaves sharply dentate or serrate above the middle. 



46. 5". subcuneatus. 

 Leaves thin. 



Earliest basal leaves cordate or reniform, rarely ovate. 

 Basal leaves entire or merely wavy. 



Stem-leaves pinnatifid with dilated auricled bases ; rays orange or red. 



47. S. pyrrochrous. 

 Stem-leaves entire or nearly so, not auricled ; rays yellow. 



48. S. Tracyi. 

 Basal leaves serrate or crenate. 



Basal leaves usually coarsely serrate; heads 8-10 mm. high. 



49. S. pseudaureus. 

 Basal leaves small, crenate ; heads 8 mm. or less high. 



50. S. Hartianus. 

 Basal leaves obovate or oval, crenate or sinuate-dentate. 



