CARDUACEAE. 
391 
III. OCCIDENTALES. 
Plant 2-3 dm. high; stem-leaves obovate or oblong, clasping. 
Plant very leafy; involucres about 2 cm. broad, short-peduncled or subsessile ; 
achenes strigose. 10. .S', carthamoides. 
Plant less leafy; involucres about 15 mm. broad, distinctly peduncled; achenes 
glabrous. 11. .S', blitoides. 
Plant about 1 dm. high ; stem-leaves spatulate or ovate, not clasping. 
12. 5 '. invenustus. 
IV. Triangulares. 
One species. 13. V. triangularis. 
V. Serrae. 
Heads 12-15 mm. high; disk 8-15 mm. broad; whole plant dark green. 
14. V. admirabilis. 
Heads 8-10 mm. high; disk 5-6 mm. broad; plant light green. 
16. V. Iapathifolium. 
VI. Crassuli. 
IS- 
Stem-leaves linear or linear-lanceolate. 
Stem-leaves ovate or ovate-lanceolate. 
Leaves firm ; bracts thick and fleshy. 
Leaves thin ; bracts not very thick. 
16. 
1 7 . 
18. 
VII. Rapifolii. 
One species. 
VIII. Hydropiiili. 
19. 
One species. 
IX. Integerrimi. 
20. 
Bracts without 
black tips; leaves entire-margined. 
21. 
2i. X. integerrimus. 
Bracts usually black-tipped; leaves more or less dentate or denticulate. 
Bracts of the involucres narrowly linear-lanceolate, long attenuate. 
Leaves thick; basal ones obovate, dentate. 22. V. Hookeri. 
Leaves thin ; basal ones oblanceolate or spatulate, merely denticulate. 
23. V. dispar. 
Bracts of the involucres linear or oblong, rather abruptly acute, with lanceolate 
or triangular tips. 
Basal leaf-blades orbicular to broadly oval, rather abruptly contracted into 
the petioles. 24. .S'. Flintii. 
Basal leaf-blades spatulate to linear-oblanceolate or rarely lanceolate, gradu¬ 
ally tapering into the petioles. 
Inflorescence even in age a flat-topped corymb ; leaves more or less dentate. 
25. .S', coiumbianus. 
Inflorescence with a short-peduncled terminal head and the lateral ones 
usually very long-peduncled ; leaves merely callous denticulate. 
Basal leaves thick; their petioles shorter than the blades. 
26. .S’, perplexus. 
Basal leaves thin ; their petioles usually longer than the blades. 
23. V. dispar. 
X. Glaucentes. 
One species. 
XI. Atrati. 
27. X. anacletus. 
Bracts broadly linear, abruptly acute. 
Bracts narrowly linear, long-acute. 
XII. Cant. 
Heads 7-8 mm. high. 
Heads 1 cm. or more high. 
28. S. atratus. 
29. S. milliilorus. 
30. X. Purshianus. 
31. X. Harbourii. 
