GENERA OR FAMILIES. 163 



linear-lanceolate erect scales, and 4-5 external ones ; re- 

 ceptacle naked ; fruit compressed, striated. 



ff Pappus sessile, setaceous in the ray, feathery in the disk 

 florets. 



(165) Thrincia — involucre oblong, in one row, with a few addi- 

 tional scales at the base; receptacle punctured; fruit 

 beaked ; pappus in two rows, the outer setaceous, decidu- 

 ous, the inner longer, feathery ; marginal row of fruits, 

 scarcely beaked, with a short scaly fimbriated pappus. 



(16G) Leontodon — involucre imbricated, the exterior scales much 

 smaller in 1-3 rows ; receptacle punctured ; fruit smooth, 

 slightly beaked ; pappus in two rows, the outer setaceous, 

 persistent, the inner longer, feathery. 



f ft Pappus sessile, uniform in the ray and disk florets. 

 X Pappus in one row. 



(1G7) Oporinia — involucre imbricated, the exterior scales much 

 smaller, in several rows ; receptacle not scaly ; fruit atte- 

 nuated, uniform ; pappus feathery, dilated at the base. 



(168) Hieracium — involucre imbricated, with many oblong scales ; 



receptacle not scaly ; fruit terete, ribbed, not beaked, with 

 a very short crenulated margin ; pappus pilose. 



XX Pappus in two rows. 



(169) Picris — involucre of one row of equal scales, with unequal 



linear often spreading scales at the base ; receptacle dotted ; 

 fruit terete, transversely striated, constricted or slightly 

 beaked above ; pappus feathery, the outer row subpilose. 



(170) Cichorium — involucre in two rows, the outer of 5 short- 



ish, the inner of 8-10 longer converging scales ; recep- 

 tacle naked, or slightly pilose ; fruit crowned by a ring of 

 two rows of minute erect scales. 

 XXX Pcfppus in many rows. 

 171) Sonchus — involucre imbricated, with two or throe rows of 



M 2 



