XLIII. COMPOSITA, 59% 
- { Fiower-héads dicecious. Involucral bracts with spreading tips at least in the 
males . . 8. ANTENNARIA. 
Flower-heads all with tubular florets in the centre. Involueres not spreading 16 
A row of scales within the outer row of florets . } : . 6. FrvaGco. 
Receptacle entirely without scales . ; ; - : . 7, GNAPHALIUM. 
All the florets tubular and 5-toothed . . 2, ASTER. 
17 { srainie florets of the head, linear or filiform, although not longer than the cen- 
ral ones - 18 
Tall stiff plant. Flower- heads ovoid, in a terminal corymb 9. INULA Conysa. 
18 Flower-heads numerous and small, in a long leafy panicle. 
9. ERIGERON canadense. 
19 { Achenes without any pappus, or crowned by a small cup or minute scales 2%) 
Achenes bearing a pappus of hairs ; . 24 
20 f Receptacle bearing scales between the florets, at least among the central ones 21 
Receptacle naked (without scales between the florets) 
91 ‘ Flower-heads rather large, with a convex or conical receptacle 14, ANnTHEMIS. 
Flower-heads small, with a small flat receptacle ; 5 . 15, ACHILLEA. 
Gama bracts all green and of equal length . ; C : . 5. BELLIS. 
Involucral bracts imbricated and scarious at the edges. 24 
93 Receptacle flat or convex . . 12, CHRYSANTHEMUM. 
Receptacle conical, much elongated as the fruit ripens . 13. MATRICARIA. 
24 f Ray purple or blue . ; , 5 ; ; : : ; ‘ ‘ 25 
Ray yellow ‘ 26 
Involucral bracts and florets of the ray not numerous, oblon g-linear 2. AstEr. 
254 Involucral bracts and florets of the ray very numerous and narrow. 
3. HRIGERON. 
26 f Involucral bracts linear, equal in length, or witha few very small outer ones 27 
Involucral bracts imbricated in two or more rows . 29 
, Radical leaves large, broadly heart-shaped or orbicular, distinct from the flower- 
97 ing stem. Florets of the ray narrow and very numerous . 19. TussILAGco. 
Radical leaves none, or at the base of the flowering stem. Tas of the ray 
; linear or oblong . : ; : : . 28 
98 j Achenes of the ray without any pappus “ . 21. ‘Doronicum, 
Achenes of the ray with a pappus like those ofthe disk . ; 20. SENECIO. 
Florets of the ray not more than 10 or12. Anthers without tails 4. SonrmpaGgo. 
aot Florets of the ray very numerous, or at Ee rate above 20. Anthers with minute 
fine points or tails at their base . : : : 3 F ow!) O.-INODA. 
CYNAROIDEZ. 
Bracts of the involucre entire, obtuse or pointed, bat notprickly . ol 
30 Bracts of the involucre ending in a long, stiff point, hooked at the extremity. 
22, ARCTIUM. 
Bracts of the involucre prickly, or ending in a ited or toothed appendage 34 
Hairs of the pappus simple . : 5 : : : ° 
4 ; Hairs of the pappus oe : : : : : : : 2 . 34 
32 f Receptacle chaffy . 5 ; c : - . . 23, SERRATULA. 
~( Receptacle naked . : : : - 19. TussiILago. 
33 oe entire or coarsely toothed, “not prickly : . 24. SAUSSUREA. 
Leaves either prickly or pordered with minute stiffbrisiles . 25. Carpuvs. 
-( Bracts of the involucre ending ina simple point or prickle  . : : . 3d 
us Bracts of the involucre ending in a fringed or toothed appendage, or in several 
points or prickles, or in aprickle branched at the base . ; 36 
Receptacle honeycombed with jagged edges to the cavities, but not bristly. 
26. ONOPORDON. 
‘Inner bracts of the involucre long, linear, shining and pprACNe outer ones 
a { Receptacle bearing long chaffy bristles between the florets. 25, CARDUUS. 
36 very prickly. Achenes silky . 4 27. CARLINA. 
Bracts of the involucre toothed or jag¢g ced, not prickly ‘ . 28. CENTAUREA. 
Bracts of the involucre prickly. Achenes glabrous . : : . . 37 
37 oe of long, simple, or feathery hairs . : : ‘ . 65. Carputs. 
Pappus of short, simple bristles or none . : ‘ . . 28, CENTAUREA. 
LIGULATE. 
38 a bearing a pappus of numerous long hairs : one tes 
Achenes without a pappus, or crowned by a few short scales. : ak 
