Nineteenth class. 
37 
Cl. 19. Syngenesia. 
Here are found all the Compositse: FIs in heads surrounded by a 
common involucre. Stas gen. 5, the anthers united in a tube round the 2-fid 
style.—Not to be confused with the Compositse are the family Dipsacese 
(Cl. 4); the genera Jasione and Phyteuma of the family Campanulacese 
(Cl. 5); Xanthium (Cl. 21 ); Armeria (Cl. 5) and Globularia (Cl. 4). 
1. FIs all ligulate. Ligulifiorce . 2 
— FIs all tubular. Tubulijlorce ..... 25 
— Inner fls (disk florets) tubular, the outer ones ligulate and 
forming a ray. Radiiflorce . . . ' . . 56 
2. Pappus 0, or forming a crown-like edging, or composed 
of short scarious chaff . .... 3 
— Pappus (at any rate that of the fr. of the disk) hairy 
orplumose. . . . . . . . 6 
3. Fls blue.Cichorium. 338. 
— Fls yellow ........ 4: 
4. Stem leafy, with several or many heads Lampsana. 335. 
— Stem leafless, with 1—3 heads . ... 5 
5. Involucral bracts conniving, after flowering, almost in 
a globe.Arnoseris. 337. 
— Invol. bracts erect, even after flowering Aposens. 336. 
6 (2). Part, at any rate, of the pappus plumose (the hairs 
bearing 2 rows of lateral hairs) . . . . 7 
— Pappus hair-like (the hairs simple, without or with 
small, extremely short, teeth) . . , . 14 
7. Receptacle with decid. chaff between the fls 
Hypochseris. 346. 
— Recept. without chaff ...... 8 
8. Plumes of the pappus intermingled 9 
— Plumes of the pappus free. (Fls yellow )... 11 
9. Involucral bracts in 1 row (almost equal in length). 
Fr. with a long beak. Ls entire . Tragopogon. 343. 
— Invol. bracts in several rows (imbricate). Fr. not beaked 
10 
10. Fr. with a swelling at the base thicker than the fr. itself. 
Ls gen. pinnatifid .... Podospermum. 345. 
— Fr. with a short, scarcely visible, swelling at the base. 
Ls undiv. ..... Scorzonera. 344. 
11 (8). Stem leafless. 12 
— Stem leafy . . . . ... . . 13 
12. Pappus of the marginal fr. short, crown-like 
Thrincia. 339. 
— Pappus of all the fr. plumose, or that of the marginal 
fr. formed of simple hairs . . . Leontodon- 340. 
13. Fr. terminated by a long filiform beak. Invol. bracts in 
2 rows, the outer ones larger, cordate-oval 
Helminthia. 342. 
