197. 
1. Pappus of many bristles. 
3. Pappus plumose. Expected (Hypochoeris). 
3. Pappus capillary or scabrous. 
4. Achenes with short, hard points above. 
5. Stems leafy; heads small, few-flowered....... Chondrilla 
5. Stems scapose; heads broad, many-flowered.... Taraxacum 
4, Achenes usually smooth (fluted and somewhat rough 
all over in Pyrrhopappus). 
6. Achenes flat or flattish; leaves, or 
most of them, sharply cleft to pinnatifid. 
7. Achenes tapering to acute or blunt 
summit, beakless; flowers 80 or 
more per head; leaves spiny.......++e.eeee+- Sonchus 
7. Achenes tapering to a stout, broadened summit 
or to a filiform beak; flowers 6 to 30 
per head; leaves not spiny except in 
one texpected Uspeciles Wiggs. it). sitesiee sls coe sre -Lactuca 
6. Achenes columnar or nearly so; leaves entire to 
remotely dentate or serrate, not pinnatifid. 
8. Achenes with long, slender beak. 
(Also, involucre double, the outer 
phyllaries short; pappus often rust- 
colored but ivory-white in specimens 
COMLECEESM) > MILA. stirsltciercdke Harorelnetells oe civics LY EEhOpappus 
8. Achenes beakless (but may taper to 
apex). 
9. Phyllaries in a single series. 
Expected (Crepis). 
9. Phyllaries in 2 or more series. 
10. Flowers white or pink; inflorescence 
a branching raceme or panicle 
of drooping heads; involucre 
cylindric. Expected (Prenanthes). 
