ORDER 70. COMPOSITE. 157 



rigid, shorter than the flowers, if Sts. simple, leafy, corymbous at top, 

 with middle-sized heads of purple flowers in Autumn. (Liatris, MX. Ell.) 



* Scales of the involucre acute, downy-toraentons. Leaves acute Nos. 1, 2 



* Scales of the involucre rounded-obtuse, nearly glabrous. Leaves obtuse ..Nos. 3, 4 



1 C. pseudo-liatris Cass. Lvs. linear-subulate, rigid, closely appressed to and cov- 



ering the stem ; hds. few, rac. or cor. ; plant downy, erect. W. Fla. to La. 2f. 



2 C. tomentdsus T. & G. Lvs. lanceolate, petiolate, the cauline lance-ovate, sessile, 



small, erect ; plant tomentous, corymb loose. Swamps, S. 2f. 



3 C. bellidifolius T. & G. Low, nearly smooth, tufted ; Ivs. spatulate below, linear 



above , hds. few, in a loose corymb ; scales herbaceous. Sand hills, N. Car. If. 

 1 C. corymfoosus T. & G. St. single, stout, erect, hairy ; Ivs. oblanceolatc, the up- 

 per oblong, sessile ; corymb dense ; scales scarious-edged. Swamps, S. 3f. 



7. LIATRIS, L. Fls. all , tubular. Invol. oblong, imbricate. Re- 

 cept. naked. Pap. of GO capillary bristles. Cyp. tapering to the slender 

 base, 10-striate. Styles much exserted. U With simple, erect stems, al- 

 ternate, entire Ivs., and handsome rose-purple flowers in spicate, racemed, 

 or paniculate heads. August November. 



Heads in a corymb or thyrse-like panicle. Root fibrous, no tuber Nos. 1-3 



Heads in a spike or a simple raceme. Root a roundish tuber. . (a) 



a Scales of the involucre colored and petaloid at their lengthened ends No. 4 



a Scales not petaloid, green or slightly tinged at the end.. (5) 



b Pappus evidently plumous. Corollas (13 to 60) hairy within Nos. 5, 6 



b Pappus evidently plumous. Cor. (3 to 5) smooth within. South Nos. 7, 8 



b Pappus only barbellate (smooth to the naked eye)..(c) 



c Heads 20-40-flowered, roundish, with rounded scales No. 9 



c Heads 7-15-flowered. d Scales all similar, obtuse . Nos. 10, 11 



d Scales all, or the inner only, acute.. ..Nos. 12, 13 



c Heads 3-7-flowered, e in a regular spike, raceme (or panicle). . .Nos. 14-16 

 e in one-sided spikes or racemes No. 17 



1 L. odorat ss.sima Willd. Vanilla Plant. Deer's Tongue. Smooth ; Ivs. obovate- 



spatulate, obtuse, thick, the cauline oblong ; heads 7-8-flowered, in a loose, compound 

 corymb. Pine-barrens, Va. to Fla. 1 3f. Used to perfume tobacco. 



2 L. paniculata Willd. Viscid-tomentons ; Ivs. lance-spatulate, the cauline small, 



pointed ; hds. 5-flwd., in an oblong, dense panicle, white-purple. Damp. S. 2 3f. 



3 It. fruticosa N. Shrubby, smooth ; Ivs. obovate, fleshy, veinless, the lowest op- 



posite ; hds. corymbed, 5-flowered ; scales lanceolate, acute, dotted. E. Fla. Lvs. 1'. 



4 1^. elegans Willd. Hairy above; Ivs. oblanceolate, cauline linear; rac. dense, If; 



hds. 4-5-flowered, scales longer and more showy than the flowers. Woods, S. 4f. 



5 1^. squarrosa Willd. Blazing Star. St. 2 3f ; Ivs. linear, the lower narrowed at 



base ; rac. leafy ; hds. few, 15-40-flowered, 912" long, scales squarrous-sp reading, 

 the outer leafy, inner sharp-pointed. Dry soils, Penn. to Fla and W. 



6 TL. cylindracea MX. St. low (6180, slender; Ivs. linear, rigid; hds. few, cylin- 



drical, 15-20-flowered ; scales short, rounded, appressed. Dry. N. Y. and W. 



7 I*. Boykinii T. & G. Lvs. linear, dotted : hds. 3 or 4-flowered in a close, virgate 



epike ; scales pointed and spreading at the tips. Near Columbus, Ga. 1 2f. 



8 I*, tenuiiolia L. Lvs. narrowly linear or filiform ; hds. 5-flwd., crowded iu a .ong 



raceme ; scales oblong, obtuse-mucronulate. Woods, S. 2 4f. Fine. 



9 L. scariosa L. Gay Feather. Scabrous-pubescent ; Ivs. lanceolate, the lower on 



long petioles, upper linear ; hds. remotely racemed ; invol. hemispherical, with obo- 

 vate, very obtuse scales. Dry soils. 4 5f. Beautiful. 



10 It. spicata Willd. Lvs. lance-linear, the lower narrowed at base; hds. sessile, in 

 a long spike ; scales oblong, obtuse, narrow-margined. N. J., W. and S. 8 5f. 



