SYNOENESIA tfJQUALIS. 409 



H. marianum : stem erect, villous ; leaves obovate or elliptic, slrigose 

 and hispid, villous on the midrib ; the lower ones slightly dentate ; 

 pedicels and calyx tomentose. 



HAB. Sandy hills. Aug. Sept. Stem 2 feet high ; pan. dense 

 ped. gland. 



329. KRIGIA. 



K. virginica: glaucous; primary leaves roundish, entire; the resi 

 lyrate, nearly smooth ; scape 1-flowered, smooth, at length longer 

 than the leaves ; calyx smooth. 



HAB. Sandy soils. May ; July, <v) ; scape 1 6 inches tiigh ; Jlow- 

 er small, orange. 



K. amplexicaulis : glaucous ; leaves oblong-ovate ; radical ones sub- 

 dendate, spathulate, scape somewhat leafy, often bifid; branches 

 2 3-flowercd ; pappus with many bristles. 



HAB. Woods. June, 1j. ; stem 1 foot high; pedunc. elong. ; flow- 

 ers large, orange. 



330. ARCTIUM. Burdock. 



/L Lappa : leaves cordate, petiolate, without, prickles. 

 HAB. Road sides, &c. July Dec. Tj. ; leaves large, spreading ; 

 Jloic&rs terminal, purple. . 



331. ONOPORDON. Cotton thistle. 



3. Acanthium: scales of the calyx spreading, subulate ; leaves ovate- 

 oblong decurrent, sinuate and spinous, woolly on both sides. 



HAB. Waste places. July, ^5 plant white and woolly; Jlowei 

 large, solitary, purple. . 



332. CNICUS. Thistle. 



* Leaves decurrent. 



3. lanceolatus . leaves decurrent, pinnatiSd, hispid ; the segments di- 

 varicate and spinous ; calyx ovate, tomentose ; scales lanceolate, 

 spreading. 



3AB. Waste places. July September, tf; stem 2 4 feet high- 

 leaves foment, beneath. . 



* * Leaves sessile. 



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 Septembrr. -1\. ; stem 3 8 feet high ; Jloic- 

 er subsolitary, large, purple or w!> ".. 



C. arvensis : leaves sessile; pinn lid, spinous; stem paniculate; 

 calyx ovate or globose; scales ate-lanceolate, mucronate, ap- 

 pressed. 



HAB. Road sides, &c. July, ^; -oot creeping; stem 2 3 feel 

 high ; floiccr small, purple. 1 



C. discolor : leaves sessile, lanceolate, pinnatifid, smooth above, white 



