242 DICOTYLEDONS. COMPOSITE. Aster, 



ed, pappus as long as the florets of the ray, leaves lanceolate 

 obtuse, p. 242. Mountain pastures. 



2. E. alpinum, stems with usually only one flower, pappus much 

 shorter than the florets of the ray, leaves lanceolate, p. 242. 

 Alpine rocks. 



27. TUSSILAGO. 



Involucre simple, equal, submembranaceous, swelling. Receptacle 

 naked. Pappus simple. 



* Flowers rayed. Scape single-flowered. 



1. T. Farfara, scape single-flowered imbricated with scales, 

 leaves cordate angular toothed downy beneath, p. 242. 

 Clayey Jlelds. 



** Flowers all tubular. Scapes many -flowered. 



2. T. Petasites, thyrsus ovato-oblong, leaves cordate unequally 

 toothed with the lobes approximate downy beneath, p. 243. 

 River-sides. 



28. SENECIO. 



Involucre subcylindrical, equal, scaly below ; the scales withered 

 at the tip. Receptacle naked. Pappus simple. 

 * Florets all tubular. 



1. S.vulgaris, leaves semiamplexicaul pinnatifid toothed, flowers 

 in clustered corymbs destitute of a ray. p. 243. Waste ground. 



** Flowers rayed, with the ray rolled back. 



2. S. viscosus, ray revolute, leaves pinnatifid and viscid, scales of 

 the involucre lax hairy, p. 243. Hedge banks. 



3. S. lividus, e( ray revolute, leaves amplexicaul lanceolate pin- 

 natifid and toothed, ovate scales of the involucre very short acute 

 not discoloured, "Sm. p. 243. Hilly places, rare. 



4. S. sylvaticus, ray revolute, leaves sessile pinnatifid lobed and 

 toothed, scales of the involucre very short glabrous, stem erect 

 straight corymbose, p. 244. Dry soils. 



*** Flowers rayed, with the ray patent. Leaves pinnatifid* 



5. S.Jacobcea, ray spreading, leaves lyrate bipinnatifid divaricated 

 toothed glabrous, stem erect, pericarps hairy, p. 244. Way- 

 sides. 



6. S. aquations, ray spreading, leaves lyrate serrated glabrous, 

 the lowermost obovate and undivided, involucre hemisphserical, 

 pericarps glabrous, p. 244. Wet marshes. 



**** flowers rayed. Leaves undivided. 



7. S. saracenicus, ray spreading, leaves lanceolate sharply ser- 

 iated nearly glabrous, corymbs of rather few flowers, p. 244. 

 Moist pastures. 



29. ASTER. 

 Involucre imbricated, its lowermost scales spreading (except in 



