SYNGENESIA.— .EQUALIS. 281 



471. CNICUS. Thistle. Composites. 

 * Leaves decurrent. 



1. G. lanceolatus : leaves decurrent, pinnatifid, hispid ; 



the segments divaricate and spinous ; calyx ovate, 

 tomentose ; scales lanceolate, spreading. 

 HAB. Waste places. July— Sept. £. Stem 2 — 1 

 ft. high; leav. toment. beneath. §. 



* * Leaves sessile. 



2. C. altissimus: leaves sessile, oblong-lanceolate. 



scabrous, tomentose beneath, dentate, ciliate; 

 radical ones pinnatifid ; calyx ovate, bracteate ; 

 scales ovate-lanceolate, spinous, appressed. 

 HAB. Old fields. June— Sept. U . Stem 3—8 

 ft. high; fi. subsolit., large, purp. or wh. 



3. C. arvensis : leaves sessile; pinnatifid, spinous; 



stem paniculate ; calyx ovate or globose ; scales 

 ovate-lanceolate, mucronate, appressed. 

 HAB. Road sides, kc. July. U . Root creep. ; 

 stem 2 — 3 ft. high; fi. sm. } purp. § ? 



4« C. horridulus : leaves sessile, pinnatifid, acutely 

 laciniate, very spinous, woolly beneath; involu 

 crum many-leaved, 1-fiowered, scales acute. 

 HAB. Fields. June— Aug. $. Stem 1—2 ft. 

 high ; fi. axil, and term., large, yeilozvish. 



>. C. muticus: leaves all pinnatifid, woolly beneath : 



segments spinulous, somewhat acute ; branches 



naked, 1 -flowered ; calyx globose ; scales unarmed, 



HAB. Meadows. Aug. — Sept. g. Stem subsimp.. 



3 — 4 ft. high ; cal. woolly. 



«j. C. discolor: leaves sessile, lanceolate, pinnatifid. 

 smooth above, white and tomentose beneath ; seg- 

 ments 2-lobed, spinous; calyx subglobose ; scales 

 appressed, with reflexed points. 

 HAB. Thickets. July— Sept. $ . Stem 3—5 

 ft. high, much branch. ; fi. red. -purp. 



7. C. xirginianus: stem simple, attenuated, mostly 1- 

 tlowered ; leaves sessile, lanceolate, hoary and 

 tomentose beneath, very smooth above, remotely 

 dentate ; teeth spinous ; calyx ovate ; scales im- 

 pressed, with short points, carinatc. 

 A a 2 



