LU. COMPOSITAE. 449 
cee, and Cichoriacee, and with few exceptions also in Asteroidee, Ambrosiee, Anthemidea, 
md Gnaphaliez ; almost always opposite in Zupatoriacez and Helianthea. In Qn aphaliee 
: am 
The flower-heads are zeegt and discoid in d cephale, Vernoniacee, and Eupa- 
toriacee, homogamous and ligulate in Cichoriacea, strictly unisexual in Ambrosiee, hetero: 
aous, with the florets of the ciudha ligulate or filiform in the other tri i 
i ecies o era, rare e Seca“ Anthemidee, 
dulacee, more fre equent in Gnaphali e@ an gie Senecio 
The scales of the teil sea are characteristic of Hehentkon, d occur only in a few 
exceptional genera in other tri 
Tailed anthers topeni with few exceptions the ee em te Calen- 
dilaceg, and Mutisiacee, and. prevail in a portion of ‘They never occur in 
Bus, "?aced, Helianthoa, PENN osiee, Anthemideæ, or iate din tad. are very rare in 
oniacea. 
The Pëtz is "ei deficient op reduced to a ring or cup in Ant themidee, consists of 
tigid awns o scales, or is wanting in Helianthee, and is most frequently d in other 
tribes, but vith so little. Bits that it is of very little use in tribual distinction 
Taz I. Cynarocephalee.—Leaves alternate. Fi eripi tapas the florets = 
thuar, hermaphr viec and regular or nearly so, the lobes rrow. Anther: 
usually fringed or tailed at the base. Style usually rer SC e ‘the base of the 
ranches, which are narrow and obtuse or slightly pointed and o, 
Ki gie point, Wises * CARTHAMUS. 
volucral jm s ending in a "edi spine with smaller ones at its 
3. CENTAUREA. 
T 
r$ purple. 
Paes of x "mg unequal bristle gett nib longer thai ‘the 
Sien! bracts D in small palmate points, interme- 
In se ones nt Acne e. (Flowers yellow. 
Kand bracts en en n a long lanceolate prickle. Receptacle 
hy Without bristles, “ower purple. 
ty a long E ristles, Receptacle with bristles between 
8. CENTAUREA, 
* ONOPORDON. 
me in a single row, Merl or bcr: a few 
Pa ple o utside. Involuere et prie 
p numerous, in severa 
me -bristles very unequal, ji longest or nearly all plumose. 
nvolucral bracts endin gm arious jagged appendages. 2. LEUZEA. 
h m vis iu endi mg in po rigid T or en 
1. SaussuREA. 
* CYNARA. . 
| tees nearly equal, "f simple. " Involucres usually wie 
| er. CoLEocow, has CERIS the habit of gasegenieig but with filiform bili VN 
Teme IT, Véssidacen .— Leaves alternate. Flower-heads discoid, the florets all 
; hermaphrad e and regular or nearly so. Involucre imbricate. Anthers usually 
: - the E ve tails. Style branches subulate and acute, not swollen at the 
“heads on Separate ped ae 
broad, with a fie r leafy braets. Pappus of a 
Tow of rigid flattened aa ristles . B. CenTRATHERUM. 
wa E fy b MM of pillar bristles 
4. VERNONIA. 
2 G 
