45. COMPOSITE. 
169 
if Receptacle without scales. Heads discoidal. 
(18.) 17. Aktemisia. F1. of disk perfect ; of the raj- fom., 
slender, in 1 row; or all herm. and tubular. Involucre 
roundish. Phyll. imbricate. Receptacle naked or hairy. 
Fr. obovate, with a small epigjTious disk, without pappus. 
(19.) 18. Tanacetum. F1. as in Artemisia. Involucre 
hemispherical. Phyll. imbricate. Receptacle naked. Fr. 
oblong, angular, with a large epigvnous disk (as broad as the 
fruit), crowned with a slight membranous border. 
ttt Recept.acle scaly throughout. Pappus 0. 
(20.) 13. Ajs'THEsns. Heads radiant. Fl. of the ray fern., 
or neuter, ligulate, in 1 row ; of the disk perfect, tubular. 
Receptacle convex or conical. Phyll. imbricate, of few 
rows. Fr. terete, or bliuitly teti-agonal, without pappus, 
but with a more or less prominent margin. 
[Anacycltjs. Fr. compressed, winged at the edges. Other- 
wise like Anfhemis.^ 
(21.) 12. Achillea. Heads radiant. Fl. of the ray fern., 
ligulate, short ; of the disk perfect, tubular ; tube plane-com- 
pressed, 2-winged. Receptacle nearly flat, aftei-wards often 
narrow and lengthened. Inv. ovate or oblong. Phyll. im- 
bricate. Fr. compressed, without pappus. 
(22.) IG. DiOTis. Heads discoidal. Fl. nerfect, tubular ; 
tube compressed, with 2 aui-icles at the base. Receptacle 
convex, with concave downy-topped scales. Inv. beUshaped. 
Phyll. imbricate. Fr. compressed, crowned luith the per- 
sistent auricled tube of the cor. ; pappus 0. 
C. Pappus of 2 — 5 stiff bristles. Receptacle scaly throKghoitt. 
(23.) 11. BiDENS. Heads discoidal, sometimes radiant. Fl. 
(of the ray neuter, ligulate ;) of the disk herm., tubular. 
Receptacle flat. Phyll. in 2 rows, outer row spreading. 
Branches of the style sunnounted by short cones. Fr. 
compressed, angular, rough at the edges ; the angles ending 
in 2 — 5 stiff hispid bristles. 
Suborder II. CYNAROCEPHALE^. 
Flowers all tubular. Style swollen below its branches. — 
Involucre imbricate in all our genera. 
a. Anthers with 2 bristles at their base. 
24. Saussurea. Fl. all perfect. Phyll. unarmed. Recep- 
tacle scaly. Pappius in 2 i-ows, outer of short rough bristles, 
inner feathery. 
I 
