290 



CICHOHIACEAE. 



[Vol. III. 



Nabalus nanus (Bigel.) DC. L,o\v Rattlesnake-root, or Lion's-foot. 



(Fig. 3580.) 



Prenanthes alba var. nana Bigel. Fl. Bost. Ed. 2, 



286. 1824. 

 Nabalus nanus DC. Prodr. 7: 241. 1838. 

 Prenanthes serpenla ria var. nana A. Gray, Syn. Fl. 



1: Part 2, 434. 1884. 



Glabrous throughout; stem simple, erect, 4/- 



J6' high. Basal and lower leaves slender-peti- 



oled, 3-divided, or sometimes broadly hastate, 



the divisions variously lobed, toothed, or entire, 



usually sessile, occasionally stalked; upper leaves 



much smaller, entire, toothed, or lobed, sessile, 



or short-petioled ; inflorescence thyrsoid, glomer- 



ate-spicate or racemose, rarely with 1 or 2 short 



ascending branches; involucre dark purple-brown 



or nearly black, glabrous, 4 // -6 // long, its inner 



bracts 6-8, slightly ciliate at the apex, about as 



long as the usually bright brownish pappus; outer 



bracts lanceolate to ovate-lanceolate. 



Alpine summits of the Adirondacks and the 

 mountains of New England; Nova Scotia to Labra- 

 dor and Newfoundland. Aug.-Sept. 



6. Nabalus virgatus (Michx.) DC. 

 Slender Rattlesnake-root. (Fig. 3581.) 



Prenanthes virgata Miehx. Fl. Bor. Am. 2: 84. 1803. 

 Nabalus virgatus DC. Prodr. 7: 242. 1838. 



Glabrous, somewhat glaucous; stem strict, mostly 

 simple, 2-4 high. Leaves lanceolate or oblong- 

 lanceolate, the basal and lower ones sinuatepin- 

 natifid or pinnately parted, petioled, often io / long, 

 the lobes entire or dentate, distant; upper leaves all 

 sessile, pinnately lobed, or the uppermost entire, 

 very small and bract-like; heads very numerous, 

 pendulous, about 7." broad, in a narrow, simple or 

 branched, terminal thyrsus, often unilateral; invo- 

 lucre purplish, about Y]^" thick and 5" long, its 

 principal bracts about 8, with several minute outer 

 ones; flowers white or pinkish; pappus straw-color. 



In moist sandy soil, New Jersey to Florida, near the 

 coast. Called also De Witt's Snakeroot. Sept. -Oct. 



7. Nabalus Boottii DC. Boott's 

 Rattlesnake-root. (Fig. 3582.) 



Nabalus Boottii DC. Prodr. 7: 241. 1838. 

 Prenanthes Boottii A. Gray, Syn. Fl. 1: Part 2, 435. 



1884. 



Glabrous below, commonly pubescent above; 



stem simple, 4/-1 2 / high. Leaves thickish, the 



basal and lower ones ovate, hastate, or deltoid, 



petioled, mostly obtuse, entire, or denticulate, 



i / -2 / long, the upper ovate or oblong, usually 



entire, short-petioled or sessile, much smaller; 



heads several or numerous, 10-iS-flowered, erect, 



spreading, or some of them pendulous, racemose 



or somewhat thyrsoid, 4 // ~5 // broad; involucre 



campauulate- oblong, 2 1 ^ // -3 // thick, 4 // ~7 // long, 



dark purplish-green, its principal bracts 8-10, 



obtuse or obtusish, with several shorter outer 



ones; flowers whitish, odorous; pappus brownish. 



Alpine summits of the mountains of northern 

 New England and New York. July-Aug. 



