80 



27. COMPOSIT/E. 



L. Akpiies with pappus of hairs. 

 M. Pappus of phimose hairs. 

 N. Receptacle scaly; akenes mostly 



beaked 



N. Receptacle naked. 



O. Involucral bracts in 2 or more rows. 

 Bracts in 2 rows ; outer broadly 



cordate 



Bracts in several rows ; outer not 

 cordate. 

 Outer bracts loose and spread- 

 ing ; all the akenes with 



plumose pappus 



All the bracts erect and ap- 

 pressed ; outer akenes with a 



small crown 



O. Involucral bracts in 1 row ; akenes 



beaked. 



Beak long, hollow, swollen at 



base; leaves toothed or cut ... 



Beak not swollen at base ; leaves 



entire 



M. Pappus of simple hairs; receptacle 

 naked. 

 Akenes beaked. 

 Akenes almost cylindrical, rough 



towards the top 



Akenes flattened, ribbed lengthwise 



on each side 



Akenes without beak, truncate at 

 summit. 



Akenes flattened 



Akenes cylindrical 



Hypochckeis 25 



HiCLMINTHIA 26 



PicRis 27 

 Thrincia 28 



Urospermum 29 



TnAdOPonoN 30 



Taraxacum 31 

 Lactuca 32 



SoNCHrs 33 

 Crepi.s 34 



1. Senecio, L. 



(Latin for Common Grounclsel ; said to be from .trnrx, an 



old man, in allusion to the bald appearance of the 



receptacle after the fruits have fallen.) 



Involucre c.vlindrical, of unequal bracts in 1 row, with 

 a few small accessory bracts at base ; flowers (in the 2 species 

 below) all tubular and bisexual ; style-branches truncate ; 

 anthers blunt at base; akenes cylindrical, with a pappus of 

 simple hairs in several rows: heads in terminal corymbs. 



Small annual with sessile pinnatifid leaves S. i ulgaris 1 

 Climbing perennial with stalked angular 



leaves V. Ill ildiiioid' s 2 



1. Senecio vulgfaris, L. Grovndscl. Erect, 

 annual, more or less woolly : leaves pinnatifid, Avitli spread- 

 ing, sinuate-toothed lobes, the lower leaves stalked, the 

 stem-leaves auricled and clasping ; involucre of 14-21 linear 

 bracts, with scarious black ciliate acute tips, accessory 

 bracts in 2-3 rows, black in upper lialf; akenes striata. 



