b LXXI. COMPOSIT.E. 



SiOdrihe 3. Centaure^. Heads distinct, usually inany- 

 Hovvered. Pappus various. Achenes glabrous, the areole 

 very oblique or lateral. 



Heads bomogaraous ; flowers all ^ , fertile ; 



achenes smooth, faintly ribbed 46. Triciiolepis. 



Heads heterogamous ; outer flowers 1-seriate, 

 neuter ; achenes strongly and regularly 

 5-15-ribbed 47. Volutarella. 



Thibk IX. MUTISIE.a3. Heads bomogamous ; flowers all tubular 

 and 5 , or the outer bilabiate ; or heterogamous, with the ray- 

 flowers 5 or neuter, sometimes bilabiate. Invol.-bracts usually 

 CO -seriate, unarmed or spinescent. Receptacle rarely paleaceous. 

 Corollas 2-lipped or with a deeply 5-fid limb. Anthers usually 

 tailed. Style-arms rounded or truncate, inappendiculate. Pappus 

 setose or paleaceous, rarely 0. Leaves radical or alternate, rarely 

 opposite. 



Snhtrihe 1. GocHNATiE^E. Corollas tubular ; segments of the 



limb narrow, equal or obscurely 2-lipped. Invol. -bracts 



rigid, straight, pungent. 



Pappus-hairs copious, CO- seriate 48. Dkoma. 



Pappus 1-seriate of 10 paleas, the margin 



hyaline below the middle, barbellate above. 49. Hociistetteria. 



Seeies II. L I Gr U L I F L R E J<]. Flowers all ligulate. Juice milky. 

 Tribe X. CICHORIE.ai. Heads homogamous. Corollas all ligu- 

 late ; ligules truncate, 5-toothed. Anther-bases sagittate, rarely 

 tailed. tStyle-arms slender. Pappus setose, paleaceous or 0. 

 Leaves radical or alternate, never opposite. Herbs. 



Snhtrihe 1. Lactuce^. Herbs rarely shrubby below, glabrous 

 or with simple hairs. Innermost invol.-bracts subequal, the 

 outer shorter, often very short. Achenes usually more or 

 less contracted at the base, attenuated or beaked at the 

 apex, sometimes columnar and truncate at both ends, rarely 

 winged. 



Achenes compressed, beaked ■ .^)0. LATTurA. 



Achenes compressed, not beaked f)!. Sonchus. 



Achenes Columnar, truncate at both ends ... 52. Laun^ea. 



1. CENTRATHERUM, Cass. 



Erect or diffusely branched herbs. Leaves alternate, petiolate, usually 

 toothed. Heads homogamous, pediuiculate, many-flowered, solitary, 

 terminal or leaf -opposed, rarely corymbose. In\olucre subhemispheric ; 

 bracts co - seriate, imbricate, the inner dry or scarious, the outer herba- 

 ceous, often leafy. Receptacle flat, naked or pitted. Corollas purple, all 

 tubular, equal; tube slender ; limb narrowly 5-fid. Anthers sagittate at 

 the base ; auricles obtuse. Style-arms subulate, hairy. Pappus scanty 

 or copious, short, fugacious. Achenes obtuse, with 8-10 more or less 

 prominent ribs. — -Histrib. Asia, America, and Australia; species 10. 



Leaves white beneath ; outer invol.-bracts large, often leafy. 

 Outer invol.-bracts cordate at base ; pjippus equalling tlie 



corolla-lube 1. C. liitchiei. 



