418 180. Lactuca. 39. COMPOSITtE, A. Pl.ex.cal. 



4', Lactuca viinlma. Least lettuce. 



Root-leaves lanceolate, pinnatifid; stem-leaves hastate, 

 linear, sessile, not cut; flowers racemose. 



Lactuca sylvestris minima, Rail Syn.1^63,3. 



Cliondrilla viscosa humilis, Ger. em. 28T, 5 * ; Park. 783. 



Lactuca saligna, Lin. S. P.ll 19. 



Chalky soils ; biennial or annual ; August. 

 Stem tough, rushlike, branched ; leaves keeled, spinous 

 or smooth ; bracfece arrowshape. 



VI. 181. SONCHUS. Theophrastus. Sowt/iistle. 



PericUne imbricate, becoming connivent, ventricose at 

 bottom ; scales many, unequal, in 2 or 3 series; clinanthus 

 flat, with hollow dots, bald; calathides many-flowered; ake- 

 nium compressed, streaked lengthways ; pappus hair-like, 

 sessile, very soft, fugacious. — -Stem fistulous, milky; leaves 

 runcinate, sessile ; flowers racemose or panicled. 



a. Flowers Hue; pappus rough. 



1. Sonchus alpinus. Alpine soivthistle. 

 Flowers racemose, bracteated ; peduncles and pericline 



hirsute ; leaves rather lyrate ; terminal lobes deltoid, an- 

 gular, bald, glaucous beneath. 



Sonchus flore caeruleo, Ger. em. 294, 7. 



Sonchus Canadensis, Lin. S. P. 1115. 



Sonchus alpinus, IFuds. Ft. Angl. 336, not of Linnaeus. 



Sonchus cseruleus, Camer. Epit. 281. 



Sonchus montanus, Lamarck Enc. Metli. 401. 



Hieracium caeruleura, Scopoli Cam. 976. 



Blue-flowered sowthistle. 



Alpine pastures ; perennial ; July and August. 



Root fleshy; stem 3 feet high, simple; leaves smooth, 

 upper leaves linear, fringed ; racemes solitary ; hractece 

 linear; calathide twice as long as the pericline; anthers 

 red. 



b. Flowers yelloiu ; pappus soft. 



2. Sonchus palustris. Marsh sowthistle. 

 Flowers many, panicled ; peduncles and perid'me glandu- 



larly hispid ; leaves runcinate, arrowshape at bottom, edge 

 rough. 



Sonchus tricubitaiis, folio cuspidato, Ruii Syn, IGJ, S. 

 Sonchus arboresccns alter, Ger. em. 294, 9. 

 Sonchus palustris, Lin. S. P. 1116. 

 Great tree sowthislle. 



