880 CARDUACEAE 



V. AIODESTI. 



Stem not hispid; heads distinctly peduncled; leaves slightly if at all auricled at the base, 

 thin. 

 Stem, especially upwards, with scattered long silky hairs; leaves not auricled, usually 



somewhat hairy. 6. A. major. 



Stem glandular-puberulent or glabrous below, not long-hairy. 



Leaves and lower part of the stem glabrous, the former not auricled. 



7. A. modestus. 

 Leaves short-pubescent, somewhat scabrous above; stem usually puberulent 

 throughout: leaves with small auricles. 8. A. Sayjanus. 



Stem short-hispid; heads crowded, often subsessile, subtended by bract-like leaves; 

 leaves thick, strongly auricled at the base. 9. A. Novae-Angliae. 



VI. Campestres. 

 One species. 10. A. campestris. 



VII. Oblongifolii. 

 Leaves scabrous-hirsutulous, mostly spreading or reflexed. 11. A. Kumleini. 



Leaves glabrous, except the bristly-cUiate margins, ascending. 12. A. Fendleri. 



VIII. Alpini. 



One species. 13. A. alpinus. 



IX. MOLLES. 



One species. 14. A. Jessicae. 



X. Radulini. 



Upper part of the stem and the involucres long-villous. 15. A. Richardsonii. 



Upper part of the stem and involucres short-pubescent. 16. A. meritus. 



XI. Andini. 



Stems decumbent or ascending, about 1 dm. high; leaves glabrate. 



17. A. andinus. 

 Stems erect, about 3 dm. high; leaves finely villous. 18. .4. Williamsii. 



XII. Grisei. 



Leavas rather copioiisly and permanently appressed-hirsiitulous. 



Inflorascence falsely racemose; lower leaves triple-nerved. 40. A. subracemosus. 



Inflorescence corymbiform or paniculate; leaves all 1-nerved. 



Plant 3-4 dm. liigh; stem retrorse-hirsute below. 19. A. subgriseus. 



Plant 1-1.5 dm. high; hairs of the stem not retrorse. 20. A. griseolus. 



Leaves sparingly strigose and glabrate in age, or perfectly glabrous, except the hispidu- 

 lous-ciliate margins. 

 Bracts with a green tip and midvein. 



Stem stout; leaves oblanceolate, the lower often triple-nerved. 



61. A. Underwoodii. 

 Stem slender; leaves narrowly Unear-oblanceolate or Unear, 1-nerved. 



64. A. Nelsonii. 

 Outer bracts green almost throughout. 21. A. violaceus. 



XIII. MtJLTIFLORI. 



Inflorescence very leafy, not corymbiform. 



Pubescence of the stem spreading or reflexed, hirsutulous. 



Heads less than 5 mm. high. 22. A. exiguus. 



Heads 6-8 mm. high. 23. A. crassulus. 



Pubescence of the sUun approssod or ascending. 



Bracts very unlike in Iciifitli, well imbricate, the outer much shorter; heads race- 

 mosely arraii^ied, each at the end of a sliort leafy branch (except in no. 25). 

 Bracts narrowly oblanceolate, the inner especially acutish; heads loss than 5 

 mm. high. 

 Stem much branched ; heads racemosely disposed on the more or less diverg- 

 ing branches. 24. A. mulliflorus. 

 Stem sim])lo below; heads few at the ends of the erect branches. 



25. A. siricticaulis. 

 Bracts broadly oblanceolate or the outer spatulate, very obtuse; heads over 

 5 mm. high. 26. A. polycephalus. 



Bracts almost equal in length or the outer sometimes longer; heads few or solitary 

 at the ends of th(! main branches. 

 Bracts tliiek, vtn-y sfjuarro.se, the outer spatulate, rounded at the apex: loaves 



tliiclc. densely strigose. 27. A. ciini!iii(t<iliis. 



Bracts ttiin, sliglitly squarrose, oblanceolate, acute; leaves sparingly strigose, 

 in ago often glal)rate. 28. A. falcat'us. 



Inflorescence less leafy, corymbiform; leaves glabrous, merely hispid-ciliolate; disk 6-8 

 mm. wide; stem slender. 

 Stem glabrous. 29. A. dcmulatus. 



Stem puberulent. 67. A. Ilallii. 



XIV. Sagittifolii. 



Basal leaf-bladas cordate or broadly ovate; upper stem-leaves lanceolate; achenes gla- 

 brous. 

 Petioles, midribs, and usually also the stem pubescent wth long white hairs. 



30. A. Wilsonii. 



