137° 
22. Leaves all linear es 
Upper or all leaves ovate 
23. Mens erect straggling o or r climb- 
ing perennial .. 
Small erect annual 
23a.Stem winged 
Stem wi «d e M 
24. Involucral bracts broad, obtuse ... 
Involueral bracts linear, acute ... 
25. Large erect her s^. 
Small or prostrate annual 
26. Heads pm 
Heads pec or panicles 
27. Heads len, leaf opposer 
Heads solitary, term 
. Leaves sinuate and toute, stem- 
clasping 
Mera. 1-2 - pinnatifid, lobes 
ronate 
29. Heese on slender di divaricate pani- 
Heads in small close ies | 
30. Leaves opposite 
appus 0 or setaccous . 
32. Heads small, very numerous 
Heads large, few ... "id 
33. Heads e kel ANN 
Heads m 
34. Pay bodia orbicular 
Involucral bracts oblong ... "à 
35. External bracts Seen dH gland- 
od os 
External bracts eR ‘glandular 
36. Heads oo by a few leafy 
- bra 
Bracts uitis. not ‘leafy E 
owers yellow ... rae 
39. Leaves entire or toothed ... 
eaves pinnatifid ... . 
40. Leaves ratem Rn 
Leaves radical  ... ee SB 
41. Pappus 0 or very short ... 
appus setaceous 
42. Flower heads under à b 
Flower heads à fuh or more 
43. Involucral brat scarious at 
Involucral bracts herbaceous 
14. 
16. 
me 
9 
li 
1 
e 
[e e] 
e 
as: : 
bo 
rx 
pd 
0. 
33. 
i. 
. Erigeron (p. 141). 
23. 
a. 
Conyza (p. 142). 
Grangea (p. 140). 
Cotula (p. 146). 
(p. 
Cyathocline (p. 140). 
Dichrocephala 
39. 
. Bidens (p. 145). 
. Artemisia (p. 147). 
33. 
$ Sphaeranthus (p. 143). 
Myriogyne (p. 146). 
Siegesbeckia (p. 145). 
36. 
37. 
38. 
Sanvitalia (p. 145). 
. Anisepappus (p. 144). 
. Glossogyne (p. 146). 
4l. 
47. 
42. 
44. 
Lagenophora (p. 140). 
Chrysanthemum = 
46). 
Aster (p. 140). 
