COMPOSITE 141 



beneath ; lower petioles as well as the midribs of the sessile leaves 

 grooved on the upper side, dilated at the base and amplexicaul. 



No. 1. Spathulate, obsoletely serrate. 



No. 2. Similar, but oblong- spathulate. 



Nos. 8 and 4. Oblong- spathulate, irregularly doubly dentate. 



No. 5. Spathulate, oblong, pinnatifid and dentate, sessile, sub- 

 auricled at the base. 



No. 6. Oblong, broadest at the apex, auricled at the base, sessile, 

 more deeply pinnatifid and dentate than No. 5. 



No. 7. Sublyrate, deeply pinnatifid, and irregularly incise- 

 dentate, narrowed to the base, but sessile, auricled and decurrent on 

 the stem. 



Nos. 8-10. Deeply lyrate-pinnatifid, with linear-oblong, deeply 

 dentate or cut segments, almost bipinnatifid, sessile, auricled and 

 subdecurrent ; margins revolute. 



Senecio squalidus, L. 



Primary root tapering downwards with numerous adventitious 

 fibrous rootlets, colourless. 



Hyrjocotyl 2 cm. long, -75-1 mm. thick, becoming thickened up- 

 wards, deep dull purple. 



Cotyledons spathulate, entire, petiolate, 1-3 cm. long ; limb 

 3 mm. wide, glabrous, green, suffused with purple beneath. 



Leaves cauline, petiolate, thinly pubescent on both sides, deep 

 green above and more or less suffused with purple beneath. 



No. 1. Oval, sometimes spathulate, obtuse, and cuneate at the 

 base, obsoletely serrate ; petiole somewhat dilated at the base and 

 subamplexicaul, more or less pubescent, especially at the edges, 

 channelled above. 



No. 2. Oval, obtuse, obtusely and distantly serrate. 



No. 3. Oblong, obtuse, lobed ; lobes short, subserrate. 



No. 4. Oblong, obtuse, more deeply lobed than the last ; lobes 

 subserrate, penninerved with alternate nerves. 



No. 5. Oblong, pinnatifid, obtuse ; lobes more decidedly serrate. 



The stem in the young state is covered by the semisheathing 

 petioles. 



Senecio viscosus, L. 



Hypocotyl terete, about 4 mm. long, glabrous, deep purplish- 

 red. 



Cotyledons spathulate, obtuse, entire, glabrous ; petiole slightly 

 channelled above, 8-10 mm. long. 



Leaves radical in the seedling ; petiole subamplexicaul, channelled 



