Key to the genera of the Lactuceae

1.

Receptacle paleaceous; pappus setae of central achenes plumose

Hypochaeris

 

Receptacles naked; pappus setae of barbellate or scabrid rays or setaceous

2

2. (1)

Inflorescence of solitary scapose capitula, scapes hollow; corolla tube with tufts of long hairs at apex

Taraxacum

 

Inflorescence usually branched and few to many headed, if single-headed then plants with branched hairs and phyllaries few-seriate; corolla tube never with tufts of long hairs at apex

3

3. (2)

Achenes long-beaked; corollas white, pink or violet; phyllaries uniseriate;

Picrosia

 

Achenes erostrate; corollas yellow or sometimes reddish; phyllaries uniseriate (and pappus absent) or few-seriate

4

4. (3)

Pappus absent; outermost achenes longer than central and distinctly curved

Lapsana

 

Pappus present; achenes homomorphic, equal sized and cylindrical or somewhat compressed

5

5. (4)

Pappus dimorphic, setae of setaceous and downy rays; plants with several cauline leaves; involucre urceolate; achenes often compressed, usually with 4 main ribs

Sonchus

 

Pappus biseriate and monomorphic, setae scabrid-barbellate, fragile; plants with few cauline leaves, often with a loose basal rosette; involucre turbinate or campanulate; achenes cylindrical, 10-ribbed

Hieracium