UH SYNGENESIA AJQUAL1S. 



325. PRENANTHES. 



P. iilba : radical leaves angular-hastate, somewhat lobed ; stem-leaves 

 roundish-ovate, dentate, petiolate ; racemes panicled, nodding ; calyx 

 8-cleft, 9 12-flowered. 



HAB. Low woods. August September, 1J-; stem 2 3 feet high; 

 flower white, or purple. 



P. serpentaria : radical leaves palmate-sinuate; those of the stem on 

 long petioles, with the middle segment 3-parted. 



HAB. Mountains. Aug. Sept. Flower purple. 



P. allissinia: stem branched; leaves 3-lobed, petiolate, angular, den- 

 ticulate, scabrous on the margin ; racemes axillary ; flowers nodding 

 calyx about 5-flowered. 



HAB. "Woods. Aug. 1J- ; stem 3 5 feet high ; flower yellowish. 



P. cordata : stem paniculate above ; leaves petiolate, cordate, denticu- 

 late, ciliate ; the uppermost ones sessile, oblong, entire ; flowers ra- 

 cemose, in a loose panicle, nodding ; calyx 6-cleft, 6-flowered. 



HAB. Rocky woods. Aug. 7J. ; stem 3 4 feet high ; flower yel- 

 lowish. 



326. LACTUCA. Lettuce. 



L. elongata : leaves smooth ; the lower ones runcinate, amplexicaul ; 



upper ones lanceolate, sessile ; flowers paniculate. 

 HAB. Wet woods. 1\. tf. July August; stem 4 6 feet high; 



pan. large, loose ; flower yellow. 



327. SONCHUS. Sow thistle. 



S. oleraceus : peduncles tomentose ; calyx smooth ; leaves runcinate, 



dentate. 

 HAB. Waste places. July Sept. ; stem 23 feet high, hollow ; 



flower yellow. . 



328. HIERACIUM. Hawk-weed. 



H. venosum : scape naked, paniculate, smooth ; leaves obovate-lan- 

 ceolate, a little hairy above, naked beneath, ciliate ; the veins color- 

 ed ; calyx smooth. 



HAB. Woods. July August, 1L; scape 1 2 feet high; leaves 

 radical ; flower yellow. 



H. Gronovii: scape leafy, paniculate; calyx glandular-hairy; leaves 

 obovate, obtuse, entire, strigose ; midrib beneath very villous. 



HAB. Dry hills. Aug. September, 'ZJ.; stem % feet high, nearly 

 naked; pedicels glandular. 



H. paniculatiim: smoothish ; stein erect, leafy, whitish tomentose; 

 pedicels capillary ; leaves lanceolate, naked, dentate, niembrana- 

 ceous. 



HAB. Woods. Aug. Sept. TJ.; stem 1 foot high; leaves smooth; 

 pedicels lone. 



H. Knlmii: stem erect, subvillose; leaves sessile, lanceolate, acumi- 

 nate, acutely and divaricately dentate ; panicle subcorymbose ; pedi- 

 cels tomentose. 



HAB. Rocky woods. Aug. 7}.; stem 2 feet high ; pedicels thick. 



