coMPOsiT-E. 224 



/3. ovalus (Riddcll) ; caulinc leaves nearly all ovate, on slender petioles. 



y. cordalus (Prenanthes cordata. WiUd) ; leaves cordate, on slender petioles. 



5. (ZeZ^oirfea (Prenanthes deltoidea. Ell.); Ze«rc5 deltoid, acuminate, acutely 

 denticulate. 



i. dissectus {T. &/• G.) ; Jeaues mostly 3-parted or divided, segments entire 

 or deeply cleft into 2 or 3 narrow lobes. 



3. N. Fra'SERI. Prenanthes rubicunda. P. 

 Stem smooth, corymbosely-paniculate above ; leaves subscabrous, mostly 



deltoid, often pinnately lobed, on winged petioles, the upper ones lanceolate, 

 subsessile ; involucre of about 8 scales, 8 — 12-flowered; jL<a/;/)MS straw-colored. 

 In dry, hard, soils, rare. Stem 2 — 4 feet high with paniculate branches. 

 The leaves are as variable as in our other species, sometimes all being 

 lanceolate, with only irregular indentures instead of lobes. Heads drooping, 

 with purplish scales and cream-colored corollas. It is most effectually dis- 

 tinguished from N. albus by the more lively color of the pappus. Aug. I'er. 



4. N. NANUS. Prenanthes alba. /3. nana. Bw. 



Stem simple, low, smooth ; leaves on slender petioles, the lowest variously 

 lobed or parted, the others successively deltoid-hastate, ovate and lanceolate ; 

 heads in small axillary and terminal clusters, forming a slender, racemose 

 panicle; i/iyo/wcre greenish purple, of about 8 scales and 1(J — 12 flowers; 

 pappzis dingy wliite. Tliis form of Nabalus is common on tlie White Mts., 

 where we find it with the same sportive character of foliage as appears in 

 other species. Stem 5 — 10 inches high. Heads with whitish flowers. Aug. 

 Sept. 



65. SONCHUS. 



Involucre imbricate, dilated at base; receptacle naked; 

 pappus of simple, copious, wliite-silky hairs ; achenia not 

 rostrate. 



Said to be from the Gr. <ro^(poi, hollow or soft; in allusion to the soft, 

 feeble stem of the plant. Involucre scales numerous, linear, unequal. Heads 

 many-flowered, yellow. Lvs. often spinulose. 



1. S. olera'ceous. 



Leaves sagittate amplexicaul, runcinate, snbspinulose, dentate ; peduncles 

 downy ; invidiicre at length smooth. A sordid looking plant, native of Europe, 

 naturalized in waste grounds, among rubbish, &c. The whole plant has a 

 glaucous hue. Stem angular, hollow, fragile, 2 — 3 feet in liiglil. Leaves 

 apparently clasping, with large retreating lobes at base, wavy and serrated in 

 a runcinate manner, tiie teeth ending in weak spines. Involucres dilated at 

 base, with yellow corollas. Sept. Ann. Common Sow-Thistle. 



2. S. ASPER. Vtll. S. spinulosus. Bw. 



Stem, glandular-hispid above ; leaves cordate-ample.xicaul, oblong-lanceolate, 

 undulate, spinulose, dentate ; ■peduncles subumbcllate. Hanover, N. H. 

 Found in similar situations with the former, but less common. Stem ] — 2 

 feet high, smooth except at tlie summits of the brandies, where it is covered 

 with stiff hairs, each supporting a little gland at top. Leaves with numerous 

 short, spiny teeth, wavy or slightly runcinate, tin? upper ones clasping so as 

 to appear perfoliate. Scales with few, scattered hairs. Aug. Sept. 



Roush Sow-Thislls. 



