COMPOSIT. 585 
scales, or altogether absent; leaves usually oppo- 
e cp. 58 
p: 
Inner bracts of the involucre embracing and 
enclosing the achenes of the fertile ray-florets ; 
pappus absent :— 
Outer bracts of the involucre 5, glandular 
iegesbeckia. 
Outer bracts of the involucre 4, in two opposite 
Enhydr 
pairs, glabrous ....0+.s.seceeseeseeeeeeterss ydra. 
ner bracts of the involucre all flat :— 
| 
2-awned ; outer bracts of the involucre numerous 
Ecli 
clipta. 
Scales of the receptacle concave or complicate, 
more or less enclosing and embracing the disk- 
florets :— 
Achenes_ wingless, compressed or 4-5-cor- 
ered :— 
Pappus united at the base into a ring or 
cup; flower-heads small or medium; ray- 
florets fertile :— : 
Ray-florets white with small ligules ; 
disk-achenes with 2-5 persistent awns; 
leaves opposite, at least below 
Blainvillea. 
Ray-florets yellow, ligules large; disk- 
achenes with 1-2 short, deciduous awns; 
leaves all opposite .....--++++++++++° Wedelia. 
Pappus scales or awns free from the base ; 
flower-heads large; ray-florets sterile :— 
sistent, intermediate scales present, per- 
sistent ; leaves always alternate 
thonia. 
Awns of the pappus deciduous, often 
paleaceous, without intermediate scales ; 
th 
leaves alternate or opposite...Heli 
Achenes of the disk ciliate or winged on the 
margins, laterally compressed ; heads small ; 
Spilanthes. 
leaves always OppOsite.«-+eserserr+r 
