472 ORDER 70. COMPOSITE 



Essex Mt., N. Y. St. 5 to 8' high, bearing tlio hds. in a subsimple raceme. Fls. 

 whitish and odorous. Jl., Aug. 



2 N. nanus DC. St. simple, low, smooth; Ivs. on slender petioles, the lowest 

 variously lobed or parted, the others successively deltoid-hastate, ovate and lance- 

 olate ; hds. in small, axillary and terminal clusters, forming a short, racemous 

 panicle; invol. greenish-purple, of about 8 scales and 10 12 flowers; pappus 

 dingy white. White Mts., N. H., with No. 1, where we find it with the same 

 sportive character of foliage as appears in other species. Stem 5 10' high. 

 Heads with whitish flowers. Aug. (P. alba. (3. nana Bw.) 



3 N. altissimus Hook. St. smooth, slender, straight, paniculate above; Ivs. 

 more or less deeply 3 5-cleft, all petiolate, angular, denticulate and rough-edged, 

 the lobes acuminate ; hds. pendulous ; invol. of 5 scales and about 5-flowered. 

 Tall, with cylindric, yellowish, nodding flowers, in woods, Newfoundland to N. 

 Eng. and Ky. Stem 3 5f high, bearing a narrow and elongated panicle. Heads 

 in short, axillary and terminal racemes. Aug. 



/?. OVATUS. Cauline Ivs. nearly all ovate, on slender petioles. 

 y. CORDATUS. Lvs. cordate, on slender petioles. (Prenanthes cordata "Willd.) 

 6. DELTCHDEA. Lvs. deltoid, acuminate, acutely denticulate. (P. deltoidea Ell.) 

 e. DISSECTUS. Lvs. mostly 3-parted or divided, segments entire or deeply cleft 

 into 2 or 3 narrow lobes. 



4 N. albus Hook. LION'S-FOOT. WHITE LETTUCE. St. smooth and somewhat 

 glaucous, corymbous-paniculate above ; radical Ivs. angular-hastate, often more 

 or less deeply lobed ; stem Ivs. roundish-ovate, dentate, petioled, the lobes or 

 leaves obtuse ; lids, pendulous; invol. of 8 scales, 9 12-flowered; pappus broivn. 

 Moist woods and shades, N. Eng. to Iowa, and Can. to Car. Stem stout, 2 4f 

 high, purplish, often deeply so in spots. Leaves very variable, ah 1 irregularly 

 toothed. Scales purplish. Fls. a dingy white. Aug. 



ft. SERPENTARIA. Radical Ivs. palmate-sinuate, those of the stem on long 

 petioles, with the middle segment 3-parted; upper Ivs. lanceolate. Has 

 the reputation of curing the rattlesnake's bite. (Prenanthes serpeutaria Ph.) 



5 N. Fraseri DC. St. smooth, corymbousty paniculate above; Ivs. subscabrou?, 

 hastate or deltoid, often pinnately lobed, on winged petioles, the upper ones lance- 

 olate, subsessile ; invol. of about 8 scales, 8 12-flowered ; pappus straw-colored. 

 If In dry, hard soils, Conn, arid Mid. States (rare) to Fla., common. Stem 2 4f 

 high. Leaves as variable as in other species, sometimes all being lanceolate, with 

 only irregular indentures instead of lobes. Heads drooping, with purplish scales 

 and cream-colored corollas. It is readily distinguished from N. albus by the moro 

 lively color of the pappus. Aug. (P. rubicaulis Ph.) 



6 N. virgatua DC. Glabrous and glaucous, slender and simple ; lower Ivs. sinuate- 

 pinnatifid, petiolate, middle ones toothed, sessile, upper entire partly clasping, 

 gradually reduced to the minute, subulate bracts ; hds. clustered, in a long com- 

 pound, virgate, somewhat secund raceme; invol. with about 8 scales and 10 flow- 

 ers; pappus-straw-colored. A remarkably slender, wand -like species, in sandy 

 soils, N. J. to Fla. St. 2 to 4f high, racemous half its length. Lvs. gradually 

 simplified from the base upward, as in most of the species. Sept., Oct. 



7 N. racemosus Hook. Glabrous, simple, slender; Ivs. all undivided, lower 

 oval-lanceolate, sharply denticulate, petiolate, upper ovate-lanceolate, subclasping, 

 entire ; hds. in nodding fascicles, arranged in a long, interruptedly spicate panicle ; 

 invoL of 8 to 9 scales, with 9 to 1 2 fls. ; pappus straw-color. N. J., N. "W. States 

 and Can. St. 2 to 4f high. Fls. pale red-purple. 



(3. Lvs. deeply and irregularly pinnatifid, 



8 IT. cisper Torr. & Gr. St. strict, simple, scabrous ; Ivs. simple, scabrous-pubes- 

 cent, dentate, lower ones oblong-oval, on margined petioles, upper lance-oblong 

 and lance-linear, subentire, sessile ; hds. erect, in small fascicles, in a slender, 

 elongated, compound raceme; invol. strongly hirsute, of 7 to 10 scales and with 

 11 to 14 fls.; pappus straw-color. Dry prairies and barrens, W. States (Dr. 

 Skinner), common. St. 2 to 4f high, nearly smooth. Lvs. 3 to 5' long, pubes- 

 cent or glabrous. Rac. 1 to 2f long. Fls. ochroleucous. Sept. (N. Illinoensis 

 DC.) 



9 N. crepidineus DC. Nearly glabrous ; st. tall, stout, corymbously paniculate; 



