LIT. COMPOSITE 
248 
Shrubs 
Style-arms very long, thread-like . 
Involucral bracts scarious. 
Clusters of heads enclosed by leaf-like bracts 
Clusters of heads not enclosed by bracts 
Flowers white (see also Eupatorium and Cnicus). 
Woolly herbs. Heads many-flowered. 
Heads in a terminal cluster . 
Heads in corymbs ...... 
Nearly glabrous herbs. Heads 1-4-flowered . 
. 21. Inula,.' 
. 3G. Gynura. 
. 16. Filago. 
. 19. Gnaphalium. 
. 17. Leontopodium. 
. 18. Anaphalis. 
. 47. Ainsliea. 
* * Pappus of distinct or united scales or of barbed bristles 
Pappus of 3-4 short, club-like scales. Flowers white . 2. Adenostcmma. 
Pappus a toothed ring. Flowers pale blue . . . .3. Ageratum. 
Pappus of 2 barbed bristles. Flowers yellow . . . 31. BidensA 
* * * Pappus none 
Leaves pinnately lobed or divided. 
Heads globose. Outer flowers white, inner yellow . 6. Dichrocephala. 
Heads very small, shining, numerous, in large, 
terminal panicles ....... 35. Artemisia. 3 
Heads in flat corymbs. Flowers yellow. Leaves 
finely divided 34. Tanacetum. 
Heads in small, panicled clusters. Flowers rose- 
purple. Leaves finely divided . . . . .7. Cyathocline. 
Leaves usually lanceolate, never pinnately lobed or 
divided. 
Flowers yellow. Achenes long, ending in a short, 
glandular beak ....... 23. Carpesium. 
Flowers white or pale yellow. Achenes long, 
club-shaped, covered with stalked glands . . 24. Adenocaulon. 
Heads 1-sexual. Involucre of female heads 
covered with hooked bristles ..... 25. Xanthium. 
Heads conical. Leaves opposite. Flowers white 
or yellow 30. Spilanthes. 
Heads very small, shining, numerous, in terminal 
panicles. Leaves wedge-shaped .... 35. Artemisia A 
Flowers orange-red. Involucre and leaves prickly . 46. Cartliavius. 
II. Radiate heads (ligules minute in Myriactis and Conyza) 
* Pappus of hairs 
Ray-flowers yellow. Disk-flowers yellow. 
Involucral bracts in several series, unequal. 
Leaves stalked. 
Ligules minute .12. ConyzaA 
Ligules conspicuous. 
Ray-flowers 10-12 in a head . , . .5. Solidago. 
Ray-flowers more than 20 in a head . . .21. Inula A 
Leaves sessile. Heads long-stalked . . .22. Vicoa. 
Involucral bracts in one series, equal, a few smaller 
at the base . . 38. Senecio. 
1 I. Cappa only ; the others have radiate heads. 1 2 B. tripartita only ; 
the others have radiate heads. 3 Except A. parviflora, which has wedge 
shaped leaves. 4 A. parviflora only ; the others have pinnately divided 
leaves. 5 C. stride, only ; the others have discoid heads. u Except I. 
Cappa, which has discoid heads. 
