LII. COMPOSITE 
243 
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. 1 
36. Gynura. 
16. Filago. 
19. Gnaphalium. 
17. Leontopodium. 
18. Anaphalis. 
47. Aindiea. 
* * Pappus of distinct or united scales or of barbed bristles 
Pappus of 3-4 short, club-like scales. Flowers white 
Pappus a toothed ring. Flowers pale blue 
Pappus of 2 barbed bristles. Flowers yellow . 
2. Adenostemma. 
3. Ageratum. 
31. Biden-s . 2 
* * * Pappus none 
Leaves pinnately lobed or divided. 
Heads globose. Outer flowers white, inner yellow 
Heads very small, shining, numerous, in large, 
terminal panicles . 
Heads in flat corymbs. Flowers yellow. Leaves 
finely divided ...... 
Heads in small, panicled clusters. Flowers rose- 
purple. Leaves finely divided 
Leaves usually lanceolate, never pinnately lobed or 
divided. 
Flowers yellow. Achenes long, ending in a short, 
glandular beak ...... 
Flowers white or pale yellow. Achenes long, 
club-shaped, covered with stalked glands 
Heads 1 -sexual. Involucre of female heads 
covered with hooked bristles 
Heads conical. Leaves opposite. Flowers white 
or yellow ....... 
Heads very small, shining, numerous, in terminal 
panicles. Leaves wedge-shaped 
Flowers orange-red. Involucre and leaves prickly 
6. Dichrocephala. 
35. Artemisia . 3 
34. Tanacetum. 
7. Cyathocline. 
23. Carpesium. 
24. Adenocaulon. 
25. Xanthium. 
30. Spilanthes. 
35. Artemisia A 
46. Carthamus. 
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 ..... 
Ligules conspicuous. 
Ray-flowers 10-12 in a head . 
Ray-flowers more than 20 in a head 
Leaves sessile. Heads long-stalked 
Involucral bracts in one series, equal, a few smaller 
at the base ...... 
. 12. Conyza A 
5. Solidago. 
. 21. Inula. 6 
. 22. Vicoa. 
. 38. Senecio. 
1 I. Cappa only ; the others have radiate heads. 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. stricta only ; the others have discoid heads. 6 Except 7. 
Cappa, which has discoid heads. 
