Nabalus. ■ COMPOSITJE. 483 



sharply denticulate, tapering into winged petioles; the upper lanceolate or 

 ovate-lanceolate, partly clasping, entire ; heads in short racemes or fascicles, 

 scarcely spreading, forming a long and narrow interrupted spicate panicle ; 

 involucre (of 8-10 scales) with the short peduncles very hirsute, about 12- 

 flowered ; pappus straw-color. — Hook.! fl. Bor.-Am. 1. p. 29i ; DC! I.e. 

 Prenanthes racemosa, Michx.! Jl. 2. p. 84; Torr.! compend. p. 277. Har- 

 palyce racemosa, Don, I. c. ; Beck, hot. p. 168. 



f3. spicate panicles numerous, elongated (6-8 inches), crowded, forming a 

 thyrsiform compound inflorescence. 



y. leaves deeply and irregularly laciniate-pinnatifid ! 



Canada! (Northern Canada, Michaux!) and Saskatchawan ! Wisconsin! 

 and Michigan ! to the plains and prairies of Ohio ! Also Hackensack marshes, 

 New Jersey ! /?. & y. Hackensack marshes, Mr. J. Carey! Sept. — Stem 

 2-5 feet high, striate. Flowers flesh-color or light purple. 



8. N. asper: stem virgate, simple, and with the sessile leaves scabrous- 

 pubescent; lower leaves oval-oblong, narrowed at the base, irregularly and 

 sharply toothed; the upper oblong-lanceolate, closely sessile, often entire; 

 heads mostly erect, in small fascicles, forming a long and narrow compound 

 raceme ; the short peduncles and rachis woolly-hirsute ; involucre of 8-9 

 scales, very hirsute, 12-14-flowered ; pappus straw-color. — N. lUinoensis, 

 DC. I. c. Prenanthes aspera, Michx.! Ji. 2. p. 83 (1803). P. lUinoensis, 

 Pers. syn. 2. p. 366. Chondrilla lUinoensis, Poir. suppl. 2. p. 331. 



Dry barrens and prairies of Ohio! Indiana! Illinois! Kentucky! Western 

 Louisiana! and Upper Missouri! Sept. — Stem 2-4 feet high. Leaves 

 small. Heads larger than in the preceding; the hairs of the involucre often 

 purple. Flowers sulphur or cream-color. 



9. N. crepklineus {UC.l I.e.): somewhat glabrous; stem tall and stout, 

 corymbose-paniculate ; leaves (ample) unequally toothed ; the radical deltoid- 

 hastate, the lower cauline triangular-ovate or deltoid-lanceolate, on winged 

 petioles ; those of the branches ovate-lanceolate or oblong, somewhat petioled ; 

 heads in small paniculate clusters, nodding, on short pubescent peduncles ; 

 involucre of 12-14 proper scales, hirsute, 20-35-flowered ; pappus brownish. 

 — Prenanthes crepidinea, Michx. ! Jl. 2. p. 84. P. gigantea, Raf. ! in 

 herb. DC. Hieracium crepidineum, Frcel. mss. 



Borders of thickets and cultivated fields, Ohio! Indiana! and Illinois! to 

 Kentucky ! and the high mountains of Carolina. Aug.-Oct. — Plant 5-8 feet 

 high. Lower leaves sometimes a foot long. Heads campanulate-cylindrical, 

 large. Involucre blackish. Flowers ochroleucous. 



§ 3. ^Heads nearly erect, corymbose : involucre ecalyculate {with one or two in- 

 conspicuous bracteolate scales), somewhat pubescent, few-jiowered. (Indige- 

 nous to the North West Coast.) 



10. N. alatus (Hook.) : nearly glabrous; stem paniculate-corymbose at the 

 summit ; leaves membranaceous, deltoid, acuminate, sharply or laciniately 

 toothed, with long winged petioles; the radical cordate ; the uppermost cauline 

 lanceolate, sessile; heads loosely corymbose; involucre of 7-9 lanceolate 

 somewhat acuminate minutely pubescent scales, 7-9-flowered ; pappus straw- 

 color. — Hook.! ji. Bor.-Am. 1. p. 294, t. 202. Sonchus hastatus. Less, in 

 Linneea, 6. p. 99; Bongard, veg. Siicha, I. c. p. 146. Mulgedium hasta- 

 tum, DC! prodr. 7. p. 250. 



Unalaschka, &c. Chamisso! Sitcha (also Kamtschatka), Bongard. 

 Observatory Inlet and Fort Vancouver, Dr. Scouler! — Plant a foot or 

 more high. Root or tuber small, fusiform. Flowers flesh-color. Mertens 

 {Bongard). 



