Vol. III.] 



CHICORY FAMILY. 



291 



8. Nabalus asper (Michx.) T. & G. 

 Rough White-lettuce. (Fig. 3583.) 



Prenanlhes aspera Michx. Fl. Bor. Am. 2: 83. 1803. 

 Nabalus asper T. & G. Fl. N. A. 2: 483. 1843. 



Scabrous or rough-puberulent; stem virgate, simple, 

 2-4 high. Leaves firm, oval, oblong, or oblanceolate, 

 those of the stem all closely sessile, acute or acutish, 

 dentate, denticulate, or the uppermost entire, the lower 

 sometimes clasping, 2 / ~3 / long, l /z'-i' wide, the basal 

 taperinginto winged petioles, commonly obtuse; heads 

 very numerous, erect, spreading, or slightly drooping, 

 3 // -4 // broad, 12- 16-flowered, in a long narrow thyrsus; 

 involucre oblong, i"--2.y 2 " thick, 5 // ~7 // high, very 

 hirsute, its principal bracts 8-10, with several short 

 outer ones; flowers light yellow; pappus straw-color. 



On dry prairies, Ohio to Minnesota and Nebraska, south 

 to Kentucky, Louisiana and Kansas. Aug. -Sept. 



9. Nabalus racemosus (Michx.) DC. 



Glaucous White-lettuce. (Fig. 3584.) 



Prenanthes racemosa Michx. Bor. Fl. Am. 2: 83. 1803. 

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



Stem virgate, rather stout, glabrous and some- 

 what glaucous; stem striate, 2-6 high. Leaves 

 thickish, glabrous and glaucous, the lower and basal 

 ones oval, oblong, oblanceolate, or obovate, dentate 

 or denticulate, 4 / -8 / long, mostly obtuse, tapering 

 into long margined petioles; upper leaves sessile, 

 smaller and partly clasping, lanceolate to ovate-lan- 

 ceolate, denticulate or entire, mostly acute; heads 

 very numerous, erect, spreading, or slightly droop- 

 ing, 1-16-flowered, 2 // ~3 // broad, in a long narrow 

 thyrsus; involucre oblong-cylindric, hirsute, 5"- 

 6" long, iK // - 2 K // thick, longer than the hirsute 

 peduncle, its principal bracts 8-io, with several small 

 outer ones; flowers purplish; pappus straw-color. 



In moist open places, New Brunswick and Anticosti 

 to the Northwest Territory, south to southern New York, New Jersey, Missouri and Colorado. 

 Aug.-Sept. 



Nabalus racemosus pinnatifidus (A. Gray) Britton. 

 Prenanthes racemosa var. pinnatifida A. Gray, Syn. Fl. 1: Part 2, 433. 1884. 



Leaves pinnatifid or pinnately lobed. Hackensack marshes, N. J.; near Mt. Vernon, N. Y. 

 Prenanthes Mainensis A. Gray, Syn. Fl. 1: Part 2, 433, from northern Maine, is probably a hybrid 

 between N. 7-acemosus and N tri/oliolatus. 



10. Nabalus crepidineus (Michx.) DC 



(Fig- 3585- ) 



Prenanthes crepidinea Michx Fl. Bor. Am. 2: 84. 1803. 

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



Stem glabrous or very nearly so below 7 , corym- 

 bosely branched and sometimes puberulent above, 

 stout, 5-9 high. Leaves thin, the basal and lower 

 ones hastate, ovate, oblong, or deltoid, sharply den- 

 tate, lobed, or incised, sometimes io' long, usually 

 with broadly winged petioles; the upper much 

 smaller, sessile or short-petioled, narrowed at the 

 base, not clasping, ovate, deltoid, or lanceolate, 

 acute; heads numerous, pendulous, short-ped uncled, 

 corymbose-paniculate, 4 // -6 // broad, 20-35-flowered ; 

 involucre oblong or oblong-campanulate, hirsute, 

 5 // -8 // long, about 3 // thick, dark green or purplish, 

 its principal bracts 12-15, with several very short 

 outer ones; flowers cream color; pappus brown. 



In fields and thickets, western Pennsylvania and New 

 York to Kentucky, west to Minnesota and Kansas. 

 Aug.-Oct. , ' 



Corymbed Rattlesnake-root. 



