38 
Nineteenth class. 
— Fr. slightly thinner below the pappus, but with no beak. 
Invol. bracts imbricate, the outer ones linear-lanceolate 
Picris. 341. 
14 (6). Heads containing 5 fls, fis in a single row . 15 
— Heads with more fls, fls in several rows . . 16 
15. Fr. beaked. Fls yellow . . . Phoenixopus. 352. 
— Fr. not beaked. Fls red . . Prenanthes. 350. 
16. Fr. beaked ....... 17 
— Fr. not beaked, at most only slightly narrowed towards 
the top ......... 21 
17. Fr. with tubercles or spiny scales towards the top. (Fls 
yellow) ......... 18 
— Fr. with neither scales nor tubercles. (Stem leafy) 20 
18. Scales or spines scattered, not united in a crown. Stem 
leafless.Taraxacum. 348. 
— Scales or spines united in a small 5-toothed crown round 
the base of the beak ...... 19 
19. Heads 7—12-fld. Stem leafy . . . Chondriila. 349. 
— Heads many-fld. Stem leafless or with 1—2 Is 
Willemetia. 347. 
20 (17). Fr. flat-compressed, all with filiform beaks 
Lactuca. 351. 
— Fr. not compressed, the outer ones without, or with a 
shorter, beak .Barkhausia. 355. 
21 (16). Fls blue .Mulgedium. 353. 
— Fls yellow or yellowish-red ..... 22 
22. Fr. much compressed .... Sonchus. 354. 
— Fr. not, or only slightly, compressed . . . 23 
23. Pappus dirty-white, stiff, brittle. Fr. of the same width 
all the way up, or broader towards the top 
Hieracium. 358. 
— Pappus gen. white, soft, supple (rarely rather dirty- 
white*) . 24 
24. Fr. becoming thinner towards the top, or narrowed into 
a short beak. Pappus hairs in several rows Crepis. 356. 
— Fr. entirely without a beak (as in Hieracium). Pappus- 
hairs in 1 row. (Stem leafless. Ls glabrous) 
Chlorocrepis. 357. 
25 (1). Heads 1-fld (each fl. with a separate invol.), crowded 
in a globular head .... Echinops. 322. 
— Heads several- or many-fld . . . 26 
26. Fr. crowned with pappus. 27 
— Fr. without pappus or with only a short border 52 
27. Receptacle with scales ...... 28 
*) Crepis paludosa (easily recognised by its sagittate cauline ls) and 
some others have a dirty-white, brittle pappus. 
