Vol. III.] 



CHICORY FAMILY 



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

 Rough White-lettuce. (Fig. 3583.) 



Pienanlhes aspera Miclix. Fl. Bor. Am. 2: 83. 1803. 

 Xabalus asper T. & G. Kl. N. A. 2: 4S3. 1843. 



Scabrous or rough-puberulent; stem virgate, .simple, 

 2°-4° high. Leaves firm, oval, oblong, oroblanceolate, 

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

 dentate, denticulate, or the uppermost entire, the lower 

 sometimes clasping, 2'-3' long, ><'-i' wide, the basal 

 tapering into winged petioles, commonly obtuse; heads 

 verj' numerous, erect, spreading, or slightly drooping, 

 3"-4" broad, 12- i6-flowered, in a long narrow thyrsus; 

 involucre oblong, 2"-2ji" thick, i"-~" high, very 

 hirsute, its principal bracts S-io, 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.) 



Prenanlhes 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, orobovate, 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, i-i5-flowered, 2"-3" broad, in a long narrow 

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

 b" long, iyi"-2}i" thick, longer than the hirsute 

 peduncle, its principal bracts S-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. 

 Prenanlhes racemosa var. pinnalifida A. Gray, Syn. Fl. i: Part 2, 433. 1884. 



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

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

 between N. racemosus and .^V. trifoliolatns. 



10. Nabalus crepidineus (Michx.) DC. Corymbed Rattlesnake-root. 



(Fig. 3585.) 



Prenanlhes crepidinea Mich.x Fl. Bor. Am. 2: 84. 1803. 

 Nabalus crepidineus DC. Prodr. 7: 242. 1S38. 



Stem glabrous or very nearly so below, 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 10' 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, \"-b" 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. 



